Malicious PDF — malware analysis report

Static analysis result for SHA-256 305947fa53bf7219…

MALICIOUS

PDF

81.6 KB Created: 2021-06-25 14:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04408363fc47666dc8848c639c9f4966 SHA-1: 05eaefc706f6e2c3882658197c26129a1eeab301 SHA-256: 305947fa53bf72196262afcdc368160034776bcc246f78ce8e5436a8df7fcedc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c3j8k97t04qkc3d4pci4sq8a94/lubekosegamowisoze.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cb5f0916---84680744503.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d02be398a8db8f991201cb8df63328ca/73669149583.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605693872b---luzawedirivowomavoger.pdf
    • http://bainihu.com/upfiles/editor/files/31655088254.pdf
    • http://guoyangmoju.com/userfiles/files/28748499617.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c6d21f295e9a9a8812b77e995d8a5b48/26061800532.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/58256091638.pdf
    • http://apsencollege.org/test/fckeditor/file/2114098315.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29118c8fd---20784472859.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1bc70eb0ff749c0dfb5d14d92a37cb03/27969298976.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb34d43c99---dirikufunutekuzibum.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jga8d3k547ps215vf9jrima463/82725469632.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=caribbean+trade+winds
    • 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_off0000dd19.bin
fbddb25e529931090a219519b0780a0371321930698e18a82d9612a325439327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 10332 bytes
font_01_sfnt_off0000f4a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16792 bytes
font_02_sfnt_off00010cb3.bin
2eeba02fe8344c773f9973c262f77c3667892e8d7a9c17d8593a38b611edcd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 17392 bytes

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