Malicious PDF — malware analysis report

Static analysis result for SHA-256 682608b9813aeb93…

MALICIOUS

PDF

84.6 KB Created: 2021-08-26 01:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5315ddcdec05d6a1cf6acb340761dad SHA-1: d09c2656525fb6c8ad29614ed838cc874fc70d42 SHA-256: 682608b9813aeb939e1c8f2431bdb42ee80486a6209fa210504135884533643e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to exploit SEO or compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609567ca57df2---tepaxubazolurivil.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77ee0fd1d---dagugudaxipapade.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/17615356847.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/92g5kitp51gprsiktoirckf13f/gokabajoxabufisujifakuku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vncjo8l8c3ep3smkgsbn8l7c3c/litipelonorugurowavuzon.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/30188c94e734d9b084abc3cb09d010c1/lelefutepewib.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/muzapakuxiwuzigimak.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/915c83bf9042f3b390dc6a39f91b59f7/jowuvafutisiduwav.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/13711204940.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/86130498438.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2a39c68c1e79eb132311485d5bdf8246/1937109772.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/najebenuxobavojitozafawim.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/43039797526.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61961865170.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/39155342999.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18ba2bde3---peritipazolojupukadowunom.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/8227337611.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gpi500a7jh1jf1n6t46bm4u4c5/finebavetuvivu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eaee3ecba---gurigusixigupumubanuvaxax.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/lasufudiletev.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/89298249748.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/35f42a60870893f5742fb3929da9e8f1/43191568112.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/68d57c7f80474c29505c0e0ad662778b/pakofolomemedadezudi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/71998489541.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mcca8je1lvn8k1m6de2gnktr1d/87699858275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dnd+character+creation+rulesPDF 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 17200 bytes
SHA-256: 5693b8dd5f8c4a0262cb9ed7cda616999ef5151ca966610131d26468eb6204c0
font_01_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 10568 bytes
SHA-256: 7c7737270794d1fccaa0f1fcde7b39cb99a22b3602ba5a65011da83b9a9642d1
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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