Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fec88ccc7f91399…

MALICIOUS

PDF

89.3 KB Created: 2021-07-10 05:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6447486f31186a4a61793b3e6aa7f1b0 SHA-1: 5b189663815af80afcd65b4a5dd098241a38e9ac SHA-256: 3fec88ccc7f9139980f86b68a12c4a856abfb0590b430a768921c8a55874a0b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or 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. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hissekurban.com/resimler/files/61487221477.pdf
    • http://stardentalcare.org/userfiles/file/41515117156.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f626a9f2e2---36028588897.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e99d4472b---bisomumakitutoximader.pdf
    • http://chizclean.ru/files/fck/file/98251050143.pdf
    • http://ropesadventure.com/d/files/nebuvozefusuxeboja.pdf
    • https://cengilli.com/icerik_images/file/lomeneno.pdf
    • https://oddluzanie.net/userfiles/file/78855096879.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/17645351560.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00d7f94b6bfeaf9643dfffe3e51b697e/sogakutiworan.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/85ea18b8bb8c13fd02750b804b3403e7/korewiredazilipoxob.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/044b157f92a93a448ae624d49598fc7e/pifiremutov.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/19938172144.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee518abce---pezumuzo.pdf
    • http://dok-vo.ru/userfiles/file/35697203624.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/fakajotefewuwes.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9d40855fca69a0be47db5ee892041dbf/52892557511.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l01cnj82ngqv3dr96pmmr7rv15/nuluzejusin.pdf
    • http://luisacortesearchitetto.it/userfiles/files/70551977918.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/53a2966f9d3c65caa56c57d15ab7c26b/guninozaw.pdf
    • http://aldo-ins.com/userfiles/file/neroredoxijudugodozorur.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e827fbadb96---nuwufuwagefedi.pdf
    • http://ainut.fi/userfiles/file/74608683570.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/47608970471.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mark+wahlberg+workout+routine
    • 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_off0000f9bb.bin
9131bafe6022ad7a57231f932e510f98014a5d78cee89d7c3624268aa9aae861
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 17464 bytes
font_01_sfnt_off000127b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
font_02_sfnt_off00013fcd.bin
9fb0afb69b6a173c718d179c798754afdec174e2c7658e1c7d1a38cf5a3b56ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 10628 bytes