Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b455438a8f1afc…

MALICIOUS

PDF

59.9 KB Created: 2021-10-03 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0ce41701bdc6c069fe3d3d1c845707b SHA-1: 8e17a4e11d52004b9014fd3498ddb83dd2aaea7b SHA-256: a4b455438a8f1afc996030a91e92af7bdb2aa1fd106a81a20184e8e558312112
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

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://catamma.ru/uplcv?utm_term=h1b+prevailing+wage+rates PDF link annotation
    • http://playitdirect.ca/ckfinder/uploadfiles/files/faponafena.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/mowawupavenovulutij.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1d920026---luneginaselev.pdfIn PDF document text
    • https://ka-base.no/images_students/files/fogoven.pdfIn PDF document text
    • http://teakdeck.pl/files/file/14021845202.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e314db4609---93813311081.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/vajakomobibugix.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/vupuwojelowudewuvofaj.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/27575113571.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45f0c34a---61989718550.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nesigenizure.pdfIn PDF document text
    • http://scarpatti.com/files/relilakonovoroxi.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/69267856227.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/tizivoga.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/jilebobev.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/38172739987.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff6fb8eca0b2d0ffe8aa999befcd5fe8/18481895843.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/37797004972.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nujapefulomegamibarema.pdfIn PDF document text
    • http://ceroki.com/image/files/bijikudibefu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/14228822445.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/zisonikoki.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_off0000acd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 15000 bytes
SHA-256: e9194e8e07726393cb2e701d6cf1399896dd2271d9f3301448b1cd0e11b4479b
font_01_sfnt_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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