Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f5513cb7e71358…

MALICIOUS

PDF

117.3 KB Created: 2021-09-01 12:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35ce794c3dfa94ee34f7937b85b757d1 SHA-1: 4dd65842bb97c2bfe66fa33f705f0f7008090b4a SHA-256: 79f5513cb7e7135811f1859b0cc14b655e9d10b1b72514e8256c5fc79cafe981
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://oklogistic.lv/upload/file/barulidegutixud.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cac7945b4---numokofusojupare.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3059529aa1---95095208611.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/59612492602.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/91643386740.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/17903921065.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa10989d44a---bosixo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e91f7c091cdb01a41bdd9af0f4a35c2e/nisivolidudoninuvajegaba.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/sigowirilejitoworomam.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/3593994762.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zexugopezubi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/verorogivoduxamitanule.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076d06f7f997---dedigodaborupofasa.pdfIn PDF document text
    • https://sanagustin.cl/files/kibofuwakizodiwepeb.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e03e3505b---10351634672.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bolonufuxiripur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762e3cd62b6---69638053333.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/36027095076.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/42427774329.pdfIn PDF document text
    • http://www.pvvc.cz/files/82335746703.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa201d1ec6a---55615790548.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7d17757c5c541d8f6cbec7a3b99cca9e/41741491572.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21967b4b59---vizoguwe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kkj9quj9c8dblk17s25oau3185/wezisepo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739c6be9e0---65514067158.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6e4aa17678184dd0da8e5f7790dc3c1e/pilav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=and+unto+you+peacePDF 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_off00015e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0E 10296 bytes
SHA-256: 777fc14b97747a3f24761ccd49cd725b30eb2cf7f47daed52f40b88697398093
font_01_sfnt_off0001756a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756A 22148 bytes
SHA-256: 2bba24d731e79109739f23671eb96eaf9b5f6758410f14f227003e8d8f7226e6
font_02_sfnt_off0001ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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