Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c05278dafc20654…

MALICIOUS

PDF

69.7 KB Created: 2021-05-28 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de8c5eb196a31d71148e6f88b37f0baf SHA-1: 7d164228f6339064e2da319a4806a943e19fec7f SHA-256: 9c05278dafc206544e06633b848e2ddf52b06563ca8380a7781730e79daee644
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic firings indicate a pattern of SEO poisoning and compromised CMS uploads, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=printable+spelling+words+for+2nd+grade
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7ef824f9---19431414956.pdf
    • http://eko-inwest.eu/upload/file/virovo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/9jckngvl0vtdbgcm6tuh3drgi2/96814381370.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cs6v27lvausaqnfcohoh31bpo7/lidokumeme.pdf
    • https://avenue102.com/uploads/file/netovagigiluk.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/483a5c1b2a2882176178c4876cecfb0c/59179584210.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7614768c---45521856769.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/90a1ba581058776f64472be7fe01ab9d/52887320392.pdf
    • http://agcslohian.com/userfiles/file/lusatetamefadabofadogaj.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/sf09i7tc2jp04sdfqi79r9on96/70320918167.pdf
    • http://archerelectricsupply.com/userfiles/file/vinowemejokowanireno.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/i1kgnlc9vv0h1qa5u5ibj3cl83/sovikuruzasavunovadotaxif.pdf
    • http://vorne-sitzen.eu/pcms/content/file/46899689374.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbe998bb2---lutijikomemukam.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af999d19aeb---97634216985.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d308.bin
07e98774e8c2635221e1bcf7f2ee6eb52816fb085dc1632e278b8bde70e7012c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 5572 bytes
font_01_sfnt_off0000e61b.bin
29f31d8aa08c669b9c83bd28f21e97002729c979dca59bd456310c55ab982e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10524 bytes

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