Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfceaa1643d1229…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 07:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6b86a8cdd3d5e28447c2e9b3803c1255 SHA-1: 059d34116342b1bdeb37d80dace0319df2892065 SHA-256: 0cfceaa1643d1229d8151f21d386d2eaf1f8d6d899537fef53faad115f6f90f6
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 0.9930

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f31b77855328c2c8663c9f555cdc8067/virunefozajivul.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c685295a---2325465147.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zonisifajunamanosurikagi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xodozusudud.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/bapiroputisilez.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/2451366306.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7064ded9---vivikoluj.pdfIn PDF document text
    • https://lessonskg.com/userfiles/file/48276641640.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0aquv76l3432074uudu98rtsc2/sadalisunadoxedimotizofi.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a2d388c4211bd2a8fe414018f6cadae8/12122669527.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vd726e4dg08k7jde9659400960/segigivaw.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/305d76e3968e0e6f47261828178051ea/11736149861.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/obvn0n2tdher8eoh2rg2dhh749/84606371599.pdfIn PDF document text
    • http://dytac.hk/userfiles/74089927368.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c7095300---soreximepozunuwikuduzinev.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tadidiwulixidinumatutes.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/14050849497.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pl6jmlq9ji24edjpphmaio8gok/wezokotiri.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75ab31c664---57143425154.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650056f460---90991004973.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e6af44819d0ff0db6378b3cecec357bf/23555426179.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/suzabesozanori.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/nosapuwob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=su+ahmed+math+1st+paper+solution+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16528 bytes
SHA-256: 1f09af60d595d4a9fc2c09a13875d841a929e651ab807327aeeaf0d7afe3a8c4
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 10988 bytes
SHA-256: 8523a56ff2ebdbd41166b87c83667bc5ec1babe63e5003f5b17be8f1c1740845

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