Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cfcd9e5b2e5be3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 02:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0e2ffd2052a252abb489667e1bb33d1 SHA-1: 1c0d09a716a1a1e024b92cf5f05b73d4786531ae SHA-256: 78cfcd9e5b2e5be372753b33f7fca71cb8feedd7e4e9203386691a64bb9ce906
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external links and the nature of the hosting suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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 http://puntolinea.org/userfiles/files/vekafano.pdf In PDF document text
    • http://alexhoffordphotography.com/temp/files/file/mivuwojuzexewexe.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/dowewenevowewafugadan.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/pakugesekomejukavob.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nuzifub.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37252501356.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/8151466776.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/gojara.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc90b5ee96---7686887513.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd1fedcbc---kapukak.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155827e30f---ximifikexuse.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/gifozagetojumo.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/76215276195.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/72978704751.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vbn8cvunkvihbc6vk0j68l1918/50586807653.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xedojomigazu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c754f0df222.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/vonimorenavasifori.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/72499115846.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/kidimekukupinifugivop.pdfIn PDF document text
    • http://charivne.info/images/file/56593667342.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/dv2igd00aam5dkvq0hkh820noa/pesagazaletozun.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/berafelujaveniz.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/86759980685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=compound+names+and+formulas+worksheet+threePDF link annotation
    • 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_off0000bd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 16016 bytes
SHA-256: 8b55310678633aaa7c8bc699daef4d5c28992b41447e43852e832595e87907d1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10980 bytes
SHA-256: 5f56e026960508231cb32191540e3c6d9dffb49d693bfb1213b886f255ba2c2f

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