Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f78c30c9225f923…

MALICIOUS

PDF

77.6 KB Created: 2021-07-16 15:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfa1616f552e2b6e03724b3e20907c4f SHA-1: bfb2c0315dc20af57eaa001ffb3efc6077b0f75f SHA-256: 2f78c30c9225f9232cc5d19395d3064aceb171494a7b65c6316594159f133fc3
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are indicative of a spearphishing attachment used to deliver secondary payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6834

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=the+base+of+decimal+number+is PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96c482f62---poxadezepumev.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/tirexewom.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n4a317rbspbfhs4cktde9kp02v/53286538194.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f73cb755c44e474cd81599af8e00c767/74715029271.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994b5f8e8---puvabavabelifewugefexi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nklia8usv3e9bmhfgo6d1f5r3g/pezusalebuwibigasubaf.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wilavakozava.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d403747502---newomidibonojaforilakamed.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/98784387173.pdfIn PDF document text
    • http://championsview.net/userimages/26399994577.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/radetazexudid.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tofewuri.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b342d90c540---rigimutanefuwelurejub.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ganojuwux.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k8i479li990k1noksh9battkd3/kixiziguwejupijoduwunifu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a143e2bc78c---41831516935.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/tibototokeguwibafenom.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/71576005155.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/duvefawuverulexirukewuxos.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/fajinokibuguligeliz.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/vefolatezuzenojanu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kudivebapovoj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10848 bytes
SHA-256: 86cefeaeb606fcb5f044c814eb15e27c03f9cd007cae9b59d0a99210a41f3e04
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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