Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca43ad42bd2ced9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 23:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 051125f3c27aa4b0698da1b9bb0d33bd SHA-1: 534ba6288e2a0f090f84792e003d90419b711280 SHA-256: 0ca43ad42bd2ced94f9e26934073653cd2f652e28959984c1137a5c16cca5732
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. This structure is characteristic of a link farm, often used to distribute phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://philabc.ru/uplcv?utm_term=best+game+in+shooting PDF link annotation
    • http://bscartridge.com/pic/tuxutazorodetafiz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd08670fae---89846861026.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/wedagokezamerawim.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33742612332.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dit5vmsipsbf8i9c24n3uiqe1e/simakofoxedinuferijawijo.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/88ca13bc2ebe10cdd65dacea80be06af/vexetep.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/94493193144.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nubidu.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/67572324851.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/nonewekudorapodavozex.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vuvaz.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/62522710831.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zuwesilixuvode.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f928fc5e1016638e1afe2ec7e227331/26314314685.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/7558551616.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/vonapimulenokekatax.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/64366771061.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/21016219861.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc4a50c0c---46418955352.pdfIn PDF document text
    • https://stormester.no/files/file/6222120002.pdfIn PDF document text
    • http://stefani.cz/fck/file/68916135492.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/lodowar.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/j5omhb4vung273ugh31rgelge1/venanemunupi.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/74792159235.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/xobolafasozifezukiwave.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/dubeg.pdfIn PDF document text
    • 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17148 bytes
SHA-256: 4d56f57731958a73281d3296299aece018af99538b10e894bfb2b7e885c08488
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10460 bytes
SHA-256: 20e013b03c78812c91ac0719dae63243513d5126fcbad79f6c1d2bf9692ef5ba

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