Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f45c32fff77dda…

MALICIOUS

PDF

70.8 KB Created: 2021-09-08 00:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7334f30ddcf4216a3e8b5fe7e2a7676e SHA-1: dc2fef6265abb904f1dc820132ad0a168ef8fa07 SHA-256: a3f45c32fff77dda3c29202281219c1a49b2535cf251f799a26e4083e05b291e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1edab3f71---bejutolekoxelumoz.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80347be58---doxew.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b850771bbe55a3d495ed981aa3098829/78870113855.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/xilekijirefufujawo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ea12a288---xafivoxus.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/72227200883.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/69412402766.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e12bbc84---tokivikakoxutafik.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/29950130135.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096adc289dbf---sagojotapima.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/94277911574.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bcff0cb5133516f11393d5b4b721dbec/rotofopowevikozepaxofa.pdfIn PDF document text
    • https://memoservicesrl.it/file/filerivixapajironafi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/15473414582.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7f2fdf8ce4df54080c18623fb6fb2bdf/24752071839.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/7141060138.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111842811e38---44917372077.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zivib.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210707141858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131518ee3adf---51082122854.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/42328399736.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/fagowidobelezosunakojefa.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/36364730512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=venkateswara+suprabhatam+telugu+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_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 16252 bytes
SHA-256: bf36daf9b0a45ee4106554cc7ece5a41127556ed81b20078348ddbc062a2c1ce
font_01_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 11120 bytes
SHA-256: 97220269a376c764f8d69952dfa6935c667b08af5514f6f7b881eb5635acbb80
font_02_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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