Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca6ad21eb9f5f00…

MALICIOUS

PDF

84.7 KB Created: 2021-10-08 06:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b7e0f87c97f637c332425c88f6a9e02f SHA-1: b0b343d51ed1e357191cfd81af0a2bf69bdaed36 SHA-256: aca6ad21eb9f5f000f13ac1d2b480217a209808583b378a597bf8b5e6fe9be8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of specific content, but the heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://franciscojaviermoreno.com/DocsCKeditor/files/13169829500.pdf In PDF document text
    • https://polytex.de/sites/default/files/76435297834.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/rovobojukiguko.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/49013383421.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/63198018959.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rizukus.pdfIn PDF document text
    • http://robbes.nl/media/files/40173259009.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161335f4b1f4d3---falewowogonebunoxa.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d12868899eecb014dee5414e6a8489d5/sanojurupizujidowirubu.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/jipuxexifuxug.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kibanalade.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/munuled.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7af81e8c746e0713626c7bfaeb50b76a/4252198482.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210912101623.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16140716a6537d---48681530877.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/15056201439.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/susonusivexewepubav.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/legawizugidoxen.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/76593599591.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/newolipotowazisag.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/59646246925.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/zisezimakatusitebogapudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=principles+of+engineering+thermodynamics+8th+edition+pdf+free+downloadPDF 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 19020 bytes
SHA-256: fea1bbcdddb0fdb8f73bdf28cbcd8dd10784a90f731ea71273f60ffa86ba7844
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 11476 bytes
SHA-256: 49d73c28a64bde06ce4f6b2b78179318481d9a0399bce12c40205b7f9baef4c4
font_02_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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