Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66668a837d46a3d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 11:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7348ffbd9db3bbc885f4a0a541e1579b SHA-1: ff3e46285d73652b62a8892ee8a78aff3f59d1a6 SHA-256: a66668a837d46a3da2832075001e0dd9b6c72f98551d69e159f8a7172ec8ee31
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. Heuristics indicate it functions as a link farm, potentially luring users to download malware or engage in phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=ms+office+2007+product+key+free PDF link annotation
    • https://chsins.tw/uploads/files/202109181016204038.pdfIn PDF document text
    • http://ud2-140.com/files/vabepixebifutonazamaxod.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cac4cc6aeaa5c0836c83dc303cefe69c/nisinozokek.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b175f650---nazefibaxirakiso.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/taberanesoza.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/82065877744.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc103ac05---nipabonibefibegok.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sinibufemazolitojufun.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/sererezovagidafokufezu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/16563696250.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/rafebepasiranafefodid.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/balel.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dawaj.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/64865073069.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/7726747277.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/nnse6ca6q3lrmeiakpafqqn4gh/tuvotidubomidorudesabopu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143567d63e7e---25613772580.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/17174165627.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/21359608428.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3aea68a8---46198203822.pdfIn PDF document text
    • http://ashioke.com/images/library/File/suzumadukajuzebuw.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75e642e---jatibi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wiwubiz.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 18256 bytes
SHA-256: 07429402bf0cb619c3298eec4928b8dda2308cc15481a9494f2e22cd0a70844e
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10892 bytes
SHA-256: a3779e132187f1bb09f3bff43d72e21db332f8d82dbb0d9339e8cd0ee7a192a6
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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