Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cd535852f0e30…

MALICIOUS

PDF

91.3 KB Created: 2021-07-27 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e1cec6628469718e65c8debbeeec196 SHA-1: 2e5280b0dd96cd89b4719093fe4daae71edf464d SHA-256: 405cd535852f0e30561e1ce61be723430af0eeae2af0bac999925e9d7bdc7c7a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a link farm on disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874437393e1---2703463591.pdf
    • http://abwingsbuffalo.com/uploads/files/mofefag.pdf
    • http://www.blueoak.fr/image/file/19864509824.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/q9j5a71hjmcat13ftst235qd81/86234540656.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4ff84cc6---178311673.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6df5b6fa37384d0735cbd260d09fdd1f/69284842804.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a3bd98dc---29996465890.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb7da4205d---nojadixomugukuwetuzuni.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bd6fe87804789f414e490fb1f63c1f8b/50847113464.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879fe7ae07a---37237666769.pdf
    • https://trimix.bg/UserFiles/File/pubiwegiwurus.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b0ec5813e---fipusuzexozofazuxiwibobe.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1l42gsa7o35ouh7vn8tuo01ap4/27660419185.pdf
    • http://royalgoodviewresort.com/Uploads/file/7971468596.pdf
    • http://gesundimjob.at/images/content/files/botubivum.pdf
    • https://2acontractor.it/images/file/86013843273.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06276012ce---24186371107.pdf
    • http://the-bom.kr/upfile/files/72776103850.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/50697286047.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2b00751c---felulat.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19468bda08---85565346374.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/95767020873.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7efe6641e---28163101386.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/lexufivozuxizodakapuwar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sylvia+plath+poem+daddy+summary
    • 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_off000101ab.bin
05c93d6f083cc4612accaf75f1761636320f1e3cbd47a3279409b72918da7d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10908 bytes
font_01_sfnt_off00011ae7.bin
1ee72655eac7ebfb29949bc7c6474484bf052d044de91ba2b918de0aca129a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 16424 bytes
font_02_sfnt_off00014593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14593 16792 bytes