Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c6fe6f79d65713…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 01:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c357b2506b63a876b65ade75b6993fe8 SHA-1: a3811ce764541941483fa2632e3a6e7d98706ab4 SHA-256: b6c6fe6f79d657135d29d5a7b9ec57560facbdbce7633d6a6a3da46c849d33a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDFs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm are indicative of a spearphishing attachment designed to lead the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 http://puntolinea.org/userfiles/files/zobosuvizalit.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f20cff544ffb192b1e4ea20f545b9261/90691238017.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d50ac8f4---35802775050.pdfIn PDF document text
    • http://a899.net/userfiles/file/27739870483.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/892869918.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/boxuwi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/banenobilaresusakosivasa.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/moridimidafunuzopogimib.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/kejadugepawor.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/dusibek.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/fiwoletinapivejigaf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134eebee0eb6---87298470468.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/38604839128.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/77369944631.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/dorekazikutiloxumiv.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/rulopibaf.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/52137622471.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/gikilomavagosagaxavo.pdfIn PDF document text
    • http://elma1.ru/!upload/files/dezoriwinazozejimogowoli.pdfIn PDF document text
    • http://orem.mn/uploads/files/tapemi.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/21291272525.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jopitaso.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134d67a56f50---naduba.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/wuxisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+i+play+steam+on+androidPDF link annotation
    • http://irodori.kir.jp/files/file/22416183149.pdfIn PDF document text
    • 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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 10700 bytes
SHA-256: 5bc5b1db7dee58ed7e00c23bdd084e309d727671fa09f075b341393983a6c6c4
font_01_sfnt_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 17016 bytes
SHA-256: cf6c69b851d372fe1b5d78707de0348f6207cb603456abda97d1981409c35965
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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