Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb379a959583da08…

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fe8712bc57210b149dc8ee5b0c5628b5 SHA-1: 161c724bf0381e738a035153c931d3251e9a9578 SHA-256: cb379a959583da0853e3b8e453bdc045d7eacbea32574f2e3966f719abaddc1c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing or malware distribution campaign, indicated by numerous links pointing to compromised CMS uploads and disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier output strongly support malicious intent. While no scripts were explicitly extracted, the presence of external links suggests the document is designed to lure the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n85o4q6npeb0ds74vj68o7rib1/79997183274.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vgt6049bkknfi081e5qiuqr6r6/xoxamekawewawefalase.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/6858907089.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073273f5693b---tomafa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0339a0f2---putexamav.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a461c72b911---20875020585.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/letivamam.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3e9d741ff049aac9e27e1c8a7d1355c0/5064118229.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c886849a084---movuzerewezoku.pdfIn PDF document text
    • http://www.siposferenc.hu/html/33239529156.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/304e68754d15332ec5d5b759377b0049/wulegijunolenakovuwol.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/48510083636.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9iou1ime54h1ohmn2i0tvifd52/72360597468.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb6319f0a---81904810358.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3e81ddf1---gejuwoxuxoxipuza.pdfPDF link annotation
    • https://tonitomov.com/picture/file/kojogijitududugimizasata.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/vikukop.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13953242c---83827985997.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/59595725515.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2250b37c575a99db6c13707b622e0846/81952868456.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b02b9d0fdce81394a94fb373d315ca2d/6065039298.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jifapaladew.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ofaiss92q3krfvdg7sv4bad7h7/movitikek.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vuzunorodujedi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723dd962934---lijupawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=blame+it+on+the+goose+got+me+feeling+loosePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 17728 bytes
SHA-256: ed4b20c67d0430de1a16fae554d3b66d2e82416008898007cc158f4c39f44307
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 10612 bytes
SHA-256: 0cf67f5d247e49e43c16087b578eff6f23778e6f65edadbaa6a38b6f62e26309