Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bd6eebbafb4526…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 17:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2cecf8c76946276d90e70ea8efdc7aa SHA-1: 1dc9ade08639fb0a9132d14c45604406644c83e1 SHA-256: e9bd6eebbafb452688b24d55838b66b4b7d845980e2b7b5c6207506e74a82bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://francemonde.news/UserFiles/file/24434022062.pdf In PDF document text
    • http://lagerunda.it/public/upload/file/76930629362.pdfIn PDF document text
    • https://quizai.com/uploads/files/74666296291.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/43573014639.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/tadam.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/siludojabir.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/39585914115.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/42190137641.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jisafinijejareduto.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/20929188856.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/45060614523.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/492c4999330837f46c6b586340eb907e/87167715945.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f5859b9632cbf3be451b00a2856b2559/lexawopabaxogipuji.pdfIn PDF document text
    • http://briztravel.com/upload/files/65239280261.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/takosofusulafumurozorewin.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bea251bd92884ec7a2464cf49ee90e7e/98486794439.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/juleket.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/44775568544.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d10bd6f54---mizefuretevoxipip.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4v8e0knh0tf0u9f04490qa686v/63399332154.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/mowapesuvegip.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/lukeromag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rome+total+war+ipad+cheatsPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/28571669424.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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 16912 bytes
SHA-256: b642d13571920675f8aec305fa7b4d20ecf9e76987a98f43b090b28facb9acbd
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10804 bytes
SHA-256: 56423533d0dfc69117631322e060e2ad6f9e8c985012a51a40021fdb4c8405b7
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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