Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeaa3f71bdd7ae1…

MALICIOUS

PDF

112.1 KB Created: 2021-10-16 04:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71f6a19c5bb0799b55b2478bf68de277 SHA-1: 2032a61342fedccdc2148e7328043a9ebdad5e81 SHA-256: caeaa3f71bdd7ae1614d4110663408a269f674f1330fdb17e5314d2f49a1f0f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://parikshitconstruction.com/uploads/belevafijugewilun.pdf In PDF document text
    • http://perksys.com/userfiles/file/fusujale.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/30486451454.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9bb777ad64ec7472a240b4d7c2dadaca/66139411728.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/tobigasoporunejukukoxu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/vukesukulilewogibu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/berujakotusotowipaxi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aee11d1a5c7a0cd0750056efb5036a55/rovanavofe.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/80170710713.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/xakuvam.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/99248870958.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/74206131677.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/58645153514.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109111450067808.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161693753da251---97020263672.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea5fae14e2c344895f576342bb166f14/54521339727.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/zapur.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gavukuzu.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/85950454259.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/39858206287.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/36924287966.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb6baf1d4---nurefajepasabe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137b8e0cbd---66209959457.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///11398919938.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=standing+back+stretchesPDF 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_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B02 18532 bytes
SHA-256: 62980ad4f8300c487167b82b8c3623aa68052044820919576a6d6f12317246d4
font_02_sfnt_off00019a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A4D 10792 bytes
SHA-256: 772c724b0a5b0349bd9d9053c191b7857f239a5e6dae580b968563e367945038

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