Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a5e28d3a11010d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 16:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6fbff97a025d07645d5fabee6be3b9c2 SHA-1: cc7fe78d57e6a7ce908226cf2fae1d5f5b37c830 SHA-256: 73a5e28d3a11010db4b19799fcd94053fc638d3ed30e8d6fb5ac81243bfc23a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609510d77fb90---fazosora.pdf In PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/15931497374.pdfIn PDF document text
    • http://turdv.ru/SITE/files/editor/file/60329470437.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/s015440o8rviqf2hismgms2hi1/lenoguxakikiriwudo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a22bd4855bef8258912d5e76b3953de3/nakup.pdfIn PDF document text
    • http://ausafe.net/images/art/files/63714399512.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/2pf7cuv5evlg09absd6e6v5iv2/sizox.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f30275710---49961545391.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ebf5d44c626ef646bd3c2ee9055009e4/67446899163.pdfIn PDF document text
    • https://abeess.com/userfiles/file/loboxopiporetukosupamig.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1284rn2c6sbohvh4pk37fu23v7/49689593310.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210605_973B20AB6712CDE6.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c8308244dacbcc6f2100534d325d250c/vudenufilamejimoxovakij.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/tujemuxadovelugugezojebe.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f8a68e4a---16772698248.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zewejifuwidofuzamedawolim.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eo1gffvk1176uqme7sgsltdqu3/36861535496.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f499b1e8---57067851929.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/b29k6uro2b3i71hso8t74d6cad/dalepiximevisaxewa.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/81536892174.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55eee92b33---41852369724.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2b43406100b2a4fc82835c4ce329a40b/nijimu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q1uehufl4ievo7ma0upqp9shbn/91327925512.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/15268959973.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a6set6seq08vcc6rvjp1jl4gq0/28030717809.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ve2jsqpt6n7h4fbr93ghpga310/98381729751.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97495874931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cryptic+crossword+solutionPDF 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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 17140 bytes
SHA-256: 43da04f2ca1cabc8b8117688e2c8b4abf62cb7c1c82da6a718c3755e6b77acee
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 10544 bytes
SHA-256: 3eaae1d14c2b84216eb65865ceb7eeeb9c7f68dfc79c152119cbfa3291d07a9e