Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5fd7883b32dbdb…

MALICIOUS

PDF

87.0 KB Created: 2021-07-14 08:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41ac106b612d210893640a590768d87a SHA-1: e83fec38e48c22dac467378c796781c6d535a77e SHA-256: 0a5fd7883b32dbdb637e95c0e44e836683df495bb9813a508712b9f2f207ce9b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://emke.hu/uploads/ckfinder/userfiles/files/tajamev.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847d33c28d4---salomuganuguv.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8ef694ib4mipkclcetauuq1s79/xomafodibavexinitane.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/lutiruzazoxovami.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078295a55a6e---98411718663.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092979384416---65821052675.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/30a9856a0949ec4740ce8e3a732e0004/rutopidasuzojokimapu.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/60482780625.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfadf88e9f---kebatowilexotukosemo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/atj4q41omegv3vj3onhelfpd84/69268199563.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/687ee337b8d4cc643b3c026f4f5fde02/95631964528.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xalezuzufusufikinis.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ac845614---ribetawineluto.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/nigubowaxolekisoja.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a68d03304---dejob.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/33012802266.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/30628911245.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9b802b91---85219174800.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2db226cea---felukanuxakugagirowema.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kefito.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kuxagototululigevupu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=small+bug+bites+in+a+linePDF 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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 16860 bytes
SHA-256: 6a6f5ae35e66a9ab71d16e49877cc45889ee79c3cb7d7966cb2853735265fc66
font_01_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 10548 bytes
SHA-256: dffc71ed65dd0abfef5f0c5b2c025846d82fecc98f9c3add0cf04e63dd13b580

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