Malicious PDF — malware analysis report

Static analysis result for SHA-256 094419e752345aa1…

MALICIOUS

PDF

107.3 KB Created: 2021-09-05 06:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fec5397ff310902b1eeeeea75c5a5c19 SHA-1: e4947426ac7a1ee4cd67b4468f77555b7c308a0b SHA-256: 094419e752345aa19678cf5e6cee3d43313d73d17828f363f6508a50176b8931
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • 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://infrive.ru/uplcv?utm_term=cwc+2019+match+schedule+pdf+download PDF link annotation
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifimoxuvewaro.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k2tdje3nit8j1b4ajoithhoh93/14449734657.pdfIn PDF document text
    • https://tappowine.com/file/5154142668.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee0727b4c---26520774615.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/17639745047.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/98063970425.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8177f4c857a064e7e4d2fa83842ea201/81632035984.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/67da5cc96da5c11e4097eaf1f54b3765/20010388935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e43171c38---bemumipigareril.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nimidejenafupusaxu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/83610444955.pdfIn PDF document text
    • http://skncn.com/u/files/minapikiburarisewasaru.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/58265416862.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b29f0f08---57598583202.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8329cd31c---fugajakunegotow.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/dajobusukexaf.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/27354231262.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/fapetigenubolizodesirix.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210630_6F6E33230372D6E5.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/zabikejov.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/xibobegozonubemozot.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_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E1 11372 bytes
SHA-256: e3394ea11cc18938222f2bf978503c7df23047bdb87bad22524aa067696a22fb
font_02_sfnt_off000170b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B6 18040 bytes
SHA-256: ad2abc4dda081c91a48240e94da5c2118801b393adf9db97a389a59f265bc883