Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6b4c88771b40b…

MALICIOUS

PDF

101.6 KB Created: 2021-06-30 10:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b718c57646161a6babd961809ab60378 SHA-1: 8ec708c05eade83bd7cc3b9104ac43231c176a73 SHA-256: 87e6b4c88771b40b67828bf022cc4d15ce01abc89cb5ea4c3c7a777733041138
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ece22c115---85614318235.pdf In PDF document text
    • http://arci-mp.fr/admin/File/vosowibatetifetadakijebaw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160931dd806b23---98071901969.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c92b280ec5c322d01a14031a337bcbc1/41486802577.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/dirukaginefafojilimaw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/45652b2ab6a32b62c921c2a5e4ebd782/mokefuvazukugaruga.pdfIn PDF document text
    • http://armanetti.com/images/suledovasetanalumalufax.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/127121498060a46ea7824b4.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2898040454---38535999958.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1b08b6ac---60264752036.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6be2d58f6a008b62dbf1bd5482ac34f/7121206981.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vasuvawifabesudasenegejew.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/resiwevaxo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a81eca273---situkibelumepiwabesaru.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/rusifawir.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/jegezi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b31402e2be0---84351851688.pdfIn PDF document text
    • https://oliogalanis.com/file/2650381673.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7726f1b3d---nixebefizigopewinubowa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/baa86a9a075fdd4b20cd16480180d126/dubukawaviwigow.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68d448676---fedoz.pdfIn PDF document text
    • https://coluer.ir/documents/file/93106305164.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nepf9l9fp6prmed0qsn50rc7fc/pirorefakixiw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/23f8a61c0e8bc9879419d1c481cc6939/67950164933.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7fcb0fef---dugomadapojemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=funny+answer+for+how+are+youPDF 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_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 17824 bytes
SHA-256: 526d1c196ab373a19afe949aa6e7bab94d85636841ed20be38afdf4bbfb4959f
font_02_sfnt_off00017166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17166 10352 bytes
SHA-256: c2e78c35e1f54f3d7c7eee62f96a24746d7e21acd367c10f7bd769ad1f705f7e