Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f46475a62b159ab…

MALICIOUS

PDF

90.7 KB Created: 2021-07-25 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4262aa4028af7a4e599bb63b7b6b63ab SHA-1: bb732b71d074f103a9081ebc6f09e825c98bf948 SHA-256: 3f46475a62b159ab2fa2b1872dfa6f521013bab3177784fb59dd678253be5c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6acc4875d68b8621c89eabc8c533b425/64706953113.pdf In PDF document text
    • http://teranor.com/ckfinder/userfiles/files/67530129613.pdfIn PDF document text
    • http://heureka-cz.eu/files/ditulariladunekekaxi.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/katarigukolu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e320a49a80---wenametasemakep.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a11cbca9c---pulawoxetujomijatigu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/53717315549.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/goqhomag4a54bcuvqn7csf2lc8/92009344344.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/pagotumisajunosev.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/xibixeluwubep.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/nixebokuvaguz.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/wijobawerag.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca53ccc859---53835168127.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/78832246781.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/jadebukirazorijunanilopiv.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/nuvuborav.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/70157256833.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/2487348152.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/66158239865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5104e6c---figapef.pdfIn PDF document text
    • http://aweibel.com/Photo/file/43545046804.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da982e496---91611568572.pdfIn PDF document text
    • https://toocapen.com/files/sepemusuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bike+racing+game+free+mod+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10928 bytes
SHA-256: e53cc7a40e775d82ee41519252a6077a62166c9843e764c33a225859582c1e8c
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 17244 bytes
SHA-256: 5e6b2c8549bf4f2e3dc62faf7e7b91da86c7630db228cf9e525a96d793d953f8

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