Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bcd71a686f98f3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 09:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b02b498c5eba47fff166988a273a1146 SHA-1: a683dc8446c0d34a7498111929d74b62261c5991 SHA-256: a3bcd71a686f98f3840b0c5bda87409579a008b181a714e5497020d5746f38d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution campaign. The presence of external URI findings and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=email+to+send+after+job+rejection PDF link annotation
    • http://gayaarchi.com/userfiles/file/20210810195827.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bba43a2ea67e9038e55a06105ca32076/zigeniji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b379c1835---nepusetox.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zozejosamukuzizexa.pdfIn PDF document text
    • http://teraval.cz/res/file/pizitunevos.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///43441846380.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/20878970545.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021082719164873499.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67e68969c---maxulekosuzo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef191d2f2---rovutekuxina.pdfIn PDF document text
    • http://short-story.ru/upload/file/munasumosifunazujagu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jesatopuzuti.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tavudivij.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/99152947636.pdfIn PDF document text
    • http://sun-eko.eu/files/file/dimominuruvesujeko.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/57519614205.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bgirhig7knlfgjl9hfvc2brun4/xujabop.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3e9b3e8f270d16d90e757257d8393851/93216306454.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/1116181404.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/93013548485.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48bbc98f6---92405959503.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/64116914487.pdfIn PDF document text
    • 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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 18296 bytes
SHA-256: b8025c7c0f653b32e5a1bc21d03a0cb4bb6baefe94c42ac3961949758bcba401
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 10892 bytes
SHA-256: 0719e6b7157bb43a213aee63abc3ae90f414fa9bdf66f6b1472e1de862f4b11f

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