Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eabd5d7c25bff2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 14:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8f7182288582ad6c1d029da6e82ea29 SHA-1: f93686323e9b5f05c0264da599ea35d356f568f7 SHA-256: b0eabd5d7c25bff2d21c8f35f4546ac8e4d71ef6d56c47db056bb2b00ad4ef30
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pistant.ru/uplcv?utm_term=kumkum+bhagya+29th+june+2021 PDF link annotation
    • https://giolog.biz/images/bulk_images/files/zovidaledazexoxipefonirod.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/97563027672.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/niwasiwijanowazega.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/wusepon.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/sugezidumesatedijerexax.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/127ubjcbsta558fafjg6brtn30/sinupejerejevarinaraxemaf.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/95676584188.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9741993e5c1f4cffd0c7bafacb7c034d/70632868264.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/zudunane.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccecd2f257---72324088560.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210904092731.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/wovekotutuvez.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613123cb4888c---wadoxixowikode.pdfIn PDF document text
    • http://wsm.hk/images/files/95661034471.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/94453360563.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/ditokeroloxaluja.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/9804444477.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d0051f02---kukuliwaketapopifetab.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/70531165790.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/muvivob.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/l3nam17ioitmo4t76u4qk7o1ss/fikigitamar.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/vawatobuvamifugovolor.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/59953269935.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/27948898191.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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 11056 bytes
SHA-256: 442090d247a88e7bad3f8147bbcab81ce40c9aa151ebee46428af6b09e986a79
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16952 bytes
SHA-256: 38167574b9887c0ea906d26896a39de85ac9c7d5390beab1c323e4df2125953b
font_02_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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