Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a73e45baef7da8…

MALICIOUS

PDF

94.1 KB Created: 2021-07-30 07:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5960af5fd8a8fac8106222d8a28b435 SHA-1: c3e503bf750eca39e349734b71f95d3af4497c0b SHA-256: e8a73e45baef7da833abf36acd32d19b7ed184af703f1f3392da09affdef203a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607585fa58251---watidefido.pdf In PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/39898336697.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f97f4cfafdfccc3c33e75e952d44b300/tezunaguwu.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/wiruvopiwamiwewudegi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81f8ad57f---kopososominedikulopegid.pdfIn PDF document text
    • http://homeopathyhk.com/files/83375864885.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/13692973903.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a738d283419---48477166503.pdfIn PDF document text
    • http://saptpadi.com/files/file/3024682629.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ijg8p546jgc54eu7rikag0j2h0/wimemitebunewazevetam.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b81c2663ac1b51955706b865a70d06d9/30881249850.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f1e03f391e357e29280861fecd6c73d5/14930746397.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d4345f99e1ea51dacc01a8c3089c0f41/89707287003.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc92b3dba---39310086556.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/83063729405.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/moluzuz.pdfIn PDF document text
    • https://goldenapp.net/file/71203037029.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/22721027928.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/levenekatu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/25350096308.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/43c37c0ed7f731f8e3c013d557408522/penoruvewelukamevofulano.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52081475790.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/25579860986.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/janavakodiripavigodax.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72fd0cc281---nogegodon.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/dba55a1328a0c094e93184e78a2dd5ea/burorupuzipirubow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=never+enough+choir+sheet+music+pdfPDF 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_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 18280 bytes
SHA-256: f3772964e5f031b01473456610941f1e0c2d30ea360f1f5d9b3fffa53c19afe4
font_01_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 11000 bytes
SHA-256: ea67b163d043acd9bbbab8b7be46025656abf7dcc510587d7c293df73c053c18
font_02_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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