Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbd39032c8d87af…

MALICIOUS

PDF

88.3 KB Created: 2021-08-02 17:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a73af280ceb4bad2e48f9089fdd1ec4 SHA-1: cfcc997e88ba51423326b7e4c02c4f500e8993d1 SHA-256: 8dbd39032c8d87af55b0c8c761fecccf669373530796f55a105e7a098d223cb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b699e3f148c---40599199333.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/33323ae06d7180fa61f89d9538ba83b6/lesotisijuboxirijumanine.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/57015446320.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea7ad829a---zoxariwutakegesejopali.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c1eba0e8---lilezefi.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/32279111960.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/xaputifufilanix.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vutewewatedebuga.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3558edf29775552d456aea3967844c6e/vevatuxudalutativugadi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/ravuxoforasajegozamoviz.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/49468626373.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab8d22e3dd4---rumedorez.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kifedixagolo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758d5d9b73c---64984812250.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6cbd129---zinuteravimuduxafuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/netfgbenatfj613gmrqj3np793/mitafegepis.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/vuzapekedepijebadumalo.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/roterasiwikinu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2il7uqg229d7oeo46chga89g6v/84782486707.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5asaajpalghe1cj0cl744lcr4b/kamoreko.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92686f1ae---dojazanunuxufuz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d800309bc---rotupolitagubotek.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/pupijinepedamugum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stickman+warriors+super+dragon+shadow+fight+promo+codePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 2464 bytes
SHA-256: f99f7fe83f8a27e529f9680abe69abf60a8f01d8878065e416abfbc881e92d03
font_01_sfnt_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 11372 bytes
SHA-256: 0cbd4f91d8dbb683d901e8bbaf390918ce7b6220bcbac40cae1793ef298cd5fd
font_02_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 20272 bytes
SHA-256: a86e54b2068934e3fbecc1136d7d35baa99276099d89dc057677662b652b0dbf
font_04_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 17988 bytes
SHA-256: 7184d4f0a5d234ea103fb90025ef45cd29171539befaf1a902df08b6c5e95230

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