Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fbebb33e968f79…

MALICIOUS

PDF

107.0 KB Created: 2021-07-08 09:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 286ac89c785966f670a5524fff28b8ee SHA-1: b72f1b6854d68d0da15e9f21f0c6f5ebfe15302b SHA-256: b7fbebb33e968f79f3e7f3b10cb2e3d9173c98f632032b35e67efbba3cd277e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rudolphalexander.com/uploads/files/dixepilawem.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd50a35826---dasunivowezuguvifutoxoke.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/oosoguhojb634m405hgq7k5li4/89977329718.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/5870013420.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/deqsl408dno51jlbn478voi5vr/85673002910.pdfIn PDF document text
    • http://contextuae.com/resimler/files/libosusa.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67edeb743---88368505005.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c55dce43---kuboroxufaxaroneme.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/widigovarogikarofuvi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160966a62542c2---vapevurekuvuke.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dcgqu9ub1do091c0qrvep5kuut/sobitebozizafemufarifun.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b754ac4840---vavereb.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c3e3af16---rexunazubofixogugupa.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/ruzaxijeterolejobaki.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/47814588575.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/fesofazasamile.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sifegifokukozumixe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a30f42f2007e517898978827d5efa519/nosavixotodat.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s6k4tvktts2k5gscv8f4gq98hg/67159625519.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/degabamafi.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4f45ea81eadeb1a8e74ac02d1bb779aa/gasetirabob.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wuzumesizokojasirojezozor.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/876660eccae69a2d675f4e8b6694677f/pamolikogefuf.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0e19d56dd24ef32212ee02aeafdb5f24/46668539073.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160933160eafba---medopojipijuwulejavoguga.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/28e91a318d3e4dab8642bbc36df41f2f/lutokiguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=smiley+lewis+one+nightPDF 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_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 18028 bytes
SHA-256: 1bf721d4f9bc0ffb3a24b0dd0c802b19f3163f0273c2931a3dac9c097c39bf45
font_01_sfnt_off00016f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F44 10568 bytes
SHA-256: 429c8b3f8ff077d402e6c531db5d69d2937d4cd981ac016f90e796743142a972
font_02_sfnt_off00018736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1