Malicious PDF — malware analysis report

Static analysis result for SHA-256 9839742f98ff42c3…

MALICIOUS

PDF

102.7 KB Created: 2021-08-09 14:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9df1cce50f5f0eae53ff3f34659f9383 SHA-1: 96c7d920c09c46faadaaf9fc4486e637fc226911 SHA-256: 9839742f98ff42c3e582559849d76bf331ab7ddcee98f8fb075639d1ffbc9764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of a link farm is a common tactic for initial access or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jordan.si/dokumenti/file/66771940794.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7232997b1---xeziz.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/40102881263.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e61911df159c13dc46a6daf62ea74d43/76578294643.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/17009414052.pdfIn PDF document text
    • http://balone.net/_upload/file///8986640193.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/taximoruzowalijadumusi.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/84024929543.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ccebb01fa677f9286d78f466daa1e9d3/89803217171.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9a0da59b---xavumisososu.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/93147084013.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4260d5d698---74092999126.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nedorijukepexenakowijito.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/18d0adfbfcd2bd75e301e703354bb057/ketapiwuduzazopafiz.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xafavibikara.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bolabebilati.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/kujagizagovuwudizasinin.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/95324068430.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/losiradumezojeto.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/59294849340.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/rojobuxagutuvibonuvo.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/domas.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/94680081472.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210705024243116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=realidades+2+capitulo+4a-3+guided+practice+answersPDF 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_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 11324 bytes
SHA-256: 5b0f1b0f86bb1f6fe9a157549ed4cf93299a7344b9f6007f3a37769401049fc2
font_01_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 17604 bytes
SHA-256: 4447bcc216680918458e773484f1985c5d03052797896c47c7b966f3a7ad0524

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