Malicious PDF — malware analysis report

Static analysis result for SHA-256 850dfe5aa54f044d…

MALICIOUS

PDF

97.0 KB Created: 2021-09-12 19:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9c72d8af9fe24862ed9436a922ca0e5 SHA-1: e6bf5eecdbfa184271e67c9fc5fd8a6ba25dd19c SHA-256: 850dfe5aa54f044d8dcb0fd8aca03f560b32d3349697bbdd2aa600d7a568fe91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tomaszbizon.tomaszbizon.pl/web/uploads/files/vemapibuja.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f4d8e97c---nibepuruxifajugugul.pdf
    • http://studiotecniconuti.it/userfiles/files/60096362771.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/83551722367.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/4773905948.pdf
    • http://letdentalab.com/img/files/nanuwuturemigovejebelukep.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd3bb0083---golowokowazogudaros.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/12070568725.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b879f695---28428671474.pdf
    • http://poiskvod.ru/images/file/23884285441.pdf
    • http://qdxqw.com/uploadfile/file/jalewuzodunogogatotokatu.pdf
    • https://doina.md/fckeditorfiles/file/zudewijilajuzifixivixo.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133a61e3af22---sodivoto.pdf
    • http://consulcongress.it/uploads/assets/file/supumit.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tosemixifibopete.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4aiep9gvvi8d591d1ha18lt842/jabisawonunobizij.pdf
    • https://podgoricki-klub.me/userfiles/file/63832740850.pdf
    • https://laatjehuisweerstralen.nl/upload/file/93902355579.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/081b9193852f08ab73ff633e338d59c4/xodawadilaledom.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/58a3c6fac8a0589d9e68a0bc1b1bf271/67283568277.pdf
    • http://dtjxbpzx.com/filespath/files/20210912123238.pdf
    • https://sarenpinler.com/calisma2/files/uploads/17573878514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+websites+to+stream+tv+shows+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 16792 bytes
font_01_sfnt_off00012c04.bin
484dc66e25a91cf97c636b511b3f39282721bbe4edd4d40db89bd2db9c1246ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 19416 bytes
font_02_sfnt_off00015d56.bin
bc6f95ac5fe11a1917e8d51ce0f5f5b561e1a61c55a4aebfc762da2a4057dd5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D56 10676 bytes