Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa3d390d7e4bc2e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 14:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1ffcc11d64afc6e482586d424670b68 SHA-1: 5f0fed3cfaaf4a5344e5f31337eb5371f58403bc SHA-256: 8fa3d390d7e4bc2eb092d8d19c61d614f70e17b2ceb1d2a5354c682806026ebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=hw+arc+length+geometry+worksheet PDF link annotation
    • http://donateagift.eu/userfiles/file/pajar.pdfIn PDF document text
    • http://delve-cr.com/uploads/delaj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79bcb5b78---rapufapu.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/pazamajodonodatev.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b9e7248f---61632431935.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/92435979254.pdfIn PDF document text
    • https://botroul.be/uploads/77674432413.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/19cf373e5f512c73c325fe2542dd3834/pojedipelixebupas.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0t3k07mcs1793f35s4gqmlf47i/jozoberexanesozowefa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7soi0kua0gdmlu5tnmrv3f46g2/tetuzinukip.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1486d1971---sofizosegejo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ef0fee0ba04a7d345e4669961647d395/gisimolavefimozow.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb16787180---58100900309.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/katefiwotijur.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/318f15c7a3f81f58138627a151ee0259/29683717393.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9257109067.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4a02774142512eff7f6ac6ed9dac9a91/mozexipojilexobabifodukop.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/6647933866.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/54673156524.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611d570ef340b---nirubafalavukin.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c878eb918cf40f8a93243da072402ed9/35271221770.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819792b8ddc---puduvotep.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d322c80c03---nenogagasi.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/valupokuxamutedop.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 18524 bytes
SHA-256: 3f45d8b0855377499055c6d512c6695e1c8e3b19b1969c39f5e9f50354121b47
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 10868 bytes
SHA-256: 240edb0787741b358a1f69e54852a91495841d02c9816150331e5b267dd65d05

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