Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f83ab8d618c4c65…

MALICIOUS

PDF

100.0 KB Created: 2021-08-13 19:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac2277dd9c082e865684efd36df29cdc SHA-1: 96f361cc424aedfcce9aeadbd74dfc9e4295852f SHA-256: 4f83ab8d618c4c652b83ac1a4ff7e719d51286bbd73dc8342beaaab0723b7358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://oniceh.ru/uplcv?utm_term=commonlit+answers+quizlet+the+roaring+twenties PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/9348215246.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vadupugimalugexaxij.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d145a52ff6ad879557c6386f59078bc5/fufufovijiwifukege.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c13635a4---nuriloloxirub.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28cee8104---fapanemewaxoro.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eccba7f82---68645082978.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096de66990eb---41820722329.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25e0071ebf80af94bf3fee11785b6017/37673423178.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/85881963388.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e2652a54---52685344292.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/71499249748.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/82336395792.pdfIn PDF document text
    • https://langumeistras.lt/i/File/70537572890.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bb001a5fca3564c9fb0c33f4727c28f0/nasukonaba.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fg4baqh3e07g9nlrfom5ivee4d/nokelewunumirovid.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/xagesubajimirotakotu.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/42418388500.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/42800814593.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e09ac6eb3787d741c9b3535fe518174c/zosizuriwepuragovijifago.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/83463860333.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/31704283797.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf4f7f1d3---lefabudafadekije.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/739b32609d48a37f9c259c6d4074c82b/datedafemo.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_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 10976 bytes
SHA-256: cca2d8fcdd52c096da2f9f2d343a7044179453ef4a786fef608026a9a3e5a318
font_01_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001537e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537E 18148 bytes
SHA-256: a547227ecfc4f2ecd853bf74398b1d92cfc60ec739a754d1df92d00376011c86

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