Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d00c22b4af328d4…

MALICIOUS

PDF

82.5 KB Created: 2021-07-06 10:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aea19e99759a9b0d2690c36ab85ebab6 SHA-1: 73e335c09736a59404ce29c81e7046d8487db893 SHA-256: 3d00c22b4af328d46d426a27d83f42a10b6ca6a9974e5f27c040f7b92459ef32
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains multiple links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term_redirector=True' further indicates a redirection mechanism. No scripts were extracted, and the document body was unreadable, but the heuristics strongly point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad5cd8325690d1b460b8b21ecef469c0/68839215777.pdf
    • https://africanresearchcenter.com/userfiles/file/57997314598.pdf
    • http://bahattinburyan.com/userfiles/file/jejedixup.pdf
    • https://www.avantagesapp.com/uploads/files/timupusebuvupuxudi.pdf
    • https://nbtele.com/en/cache/fck_files/file/dibowifof.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75668855f0---wulisirozelo.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/436b51c3ca668e1218a9ea4af081a670/patesebinun.pdf
    • https://alrukn.co/userfiles/files/mowizukojodagug.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/50bc793aacf9aa6ec102865587d66a02/53540177471.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/t191333as457j6br7mft45un70/magukuritikive.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608730e25150e---98569360828.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/02d2b12f158c4b5246c9d0aac25f23dc/91809749451.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0dee8920a---28635451591.pdf
    • http://artospace.com/pics/file/81801214862.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c88464c95---86473965653.pdf
    • https://pjkconstruction.ca/images/file/39724357340.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hmuio035niqngcche66pmn1vkf/92005144680.pdf
    • http://statewideroadservices.com/clients/879378/File/tipul.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608656edeff48---92243198136.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1daf2fcb64cda0f2f78776dc9b8b9976/1552879350.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/04fe0a59b41f4d2a2319dd502b895ec7/botekunopu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2096990e---15750928885.pdf
    • https://aradmissions.com/ci/userfiles/files/43007808323.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+safari+cannot+open+the+page+because+the+server+cannot+be+found
    • 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_off0000de8a.bin
2bf2627d22a8909cefbd4a7f951e19eb77ac8de190f79c1687151d1c77889a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 11112 bytes
font_01_sfnt_off0000f804.bin
f3e3e7fb20ed7ea479911adf4cd51061b90f06cdd9546d443e772fdb6123ffb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16812 bytes
font_02_sfnt_off000123e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes