Malicious PDF — malware analysis report

Static analysis result for SHA-256 325d34b2c37e2de0…

MALICIOUS

PDF

66.5 KB Created: 2021-10-03 23:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0aa0a9540d872d7e2eba7cbcb613af7c SHA-1: 5728d751bfdaf22abf5fe713bf3011ab979c1393 SHA-256: 325d34b2c37e2de0f259cdd04fe8944452c12af6d2ec6f1074ffdd3b3319349f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic by presenting itself as an image-only document with a clickable action, designed to lure users into clicking embedded links. Multiple heuristics indicate a link farm pointing to potentially compromised websites, suggesting the PDF's primary purpose is to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5476

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://infrive.ru/uplcv?utm_term=when+god+made+you PDF link annotation
    • http://branpc.in/ckfinder/userfiles/files/gofunex.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109141032544676.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89375555787.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109302316201544.pdfIn PDF document text
    • https://kueapem.com/contents/files/14638336908.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ded20163e---nivejubanorupovekomi.pdfIn PDF document text
    • http://benetalent.com/upload/files/7794058981.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/kadurisapopisetaxikaxi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/lenopelagevesuxejiwula.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/15839316733.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/pedarupibitejufafelof.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905032018.pdfIn PDF document text
    • https://ms01bet.com/contents/files/lupenuxozewukipemezi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/3369410286.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-19/20210919192753708653.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/lesidozuserurub.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/fejukil.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340577f15da---71476147097.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9b21640---47269135775.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2f42649c---noturevazofoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c966412dd---besawekisitokezuleg.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149b1df541---dinobap.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/50864604310.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/89055125124.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/lugawurofubikagija.pdfIn PDF document text
    • http://rilta.net/userfiles/files/danipuwoba.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/29219883449.pdfIn 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_off0000b5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 10396 bytes
SHA-256: 5a268efcce86268840f0ee31845a253450aebca2fb2445314a63f64659a050ff
font_02_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 14332 bytes
SHA-256: f813ab6d4260a3c59598e8b0b744a63204a57afc41943af56ece4ea9c8dc3a60

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