Malicious PDF — malware analysis report

Static analysis result for SHA-256 506c0aab5f83e8bc…

MALICIOUS

PDF

113.5 KB Created: 2021-07-22 04:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 129bb425016fadd683670ed9002d0be8 SHA-1: fb4bcfbd245959fb26fbf47a48587ab24b14416d SHA-256: 506c0aab5f83e8bc2ffe3b33027a3ef1e0809f51517975a3304acc35c820a40d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pphu-joanna.pl/fckpliki/file/76357312766.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0c3442f1855e517cf2724bf692bc8626/dusogafezatoto.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/14996050015.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/87604139729.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/54746605070.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c4a647ba---12229747013.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c6d61f92881e39875915dddbaee870e1/49836020268.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/926829cc9a85497be9a56644a478b204/pipijexukarofozuvavepil.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078608949041---73813134156.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gizenoxakutefedarog.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fumezulosi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vfpc0dqp6664n6q430ivph07ag/punevabakitilivobatiloxus.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/52998690800.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d61c52d0e---77000237699.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nenop.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/7814857280.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/47490866630.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/83153f361b7f8a82833eb45a0378951e/93779191834.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/72819490741.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/wefizikuwudikosomivujezan.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/lepulese.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d140aec45065e21a496a0cc5b11e6063/jasozofob.pdfIn PDF document text
    • https://numberonerevolution.it/file/9983688867.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///selirigisovovini.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/52125129920.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/68277137163.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/xanuxinezikapaliwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=elevated+ejection+fractionPDF link annotation
    • 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_off000158ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AC 18360 bytes
SHA-256: b709fcafcbe8998724a1f9400f064454b4b3001f4f6ea6591d96fa6c7b432958
font_01_sfnt_off00018739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18739 10480 bytes
SHA-256: 1936ea87da058b187a96b7ebf7683667281329645118ba3dec68c2df2e0306bf
font_02_sfnt_off00019f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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