Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f74a9f20a16520c…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 03:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3040f795d25722cf69d33bd8eb3ef95 SHA-1: 2fe2683bb2d44ca71228846ecfad8594727de345 SHA-256: 8f74a9f20a16520ceca59a031625b760d55277180a56c6a39fcab17f0889b0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cac5e96f7---wigofofilajetisegogizobej.pdf In PDF document text
    • http://rapet.hu/files/6328989872.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/lanus.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/sanosuku.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e3fda4e6---bonivegibem.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pigawosisexerafapawabuli.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ac51d6156b350d8442352fc0fd745519/petokalawuzezasarar.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/58902522311.pdfIn PDF document text
    • http://sciattella.net/images/file/29242337843.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o7maqpa8bpjs4t9gs85sg7b766/mozawedodube.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/9636923412.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df9c39e4a4b214189d5503f27545698e/tukenafixenelirixifi.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/20844067262.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/6416434625.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/95551092488.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/91642150000.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4e0b94c7e---kilisusosole.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jmri1v029ab87c9eadsftg6rm6/mavut.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fafigadaz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0695071---38330147875.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/bj2u4ii9f3s2g5htk57gfkvpg6/dinixosaxulepuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=benign+prostatic+hypertrophy+with+urinary+retention+icd+10PDF 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_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 17920 bytes
SHA-256: 4aa99b151e8145f66db09f2c0b317b217c2a63c51848384a78540fd5c5e0c3c3
font_01_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 11272 bytes
SHA-256: 66009472ff2b2f1679270dc5c2c9e3f5be8c3de64e9f869b992b68d4d3b07b32
font_02_sfnt_off00014cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1