Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9aa4d99cb50e2d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 18:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c565e4d90f1ad130e68a45f60582c88 SHA-1: b4b76dc130625e5d873f3a2234cd43c1fa05187f SHA-256: df9aa4d99cb50e2db54f6cc11254d363983e328517c43928af6de9311ea02747
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to trick users into downloading malicious content. The 'SE_DOWNLOAD_BUTTON' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, along with the ML classifier and ClamAV detection, strongly indicate a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://karinbentum.nl/uploads/file/viwozoguxoneli.pdf In PDF document text
    • http://avision-italia.com/userfiles/files/17129780642.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/julomotesinotaruxi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34011d1b4---22909703061.pdfIn PDF document text
    • https://scalper.ir/data/files/file/46222461226.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/buvuropowurosi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/79310954043.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/0aa76bdb57cfacc821b81420b7a47d7a/1759018470.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51501dcb77c6878d61f3dbd4ed05f349/70999720873.pdfIn PDF document text
    • http://sbairs.com/datas/files/41211555782.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/19954967071.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609be92c3e534---mewulagubezikagunuzaloxa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e9cf3a1f---dimogepas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fa140e940bccaca37cb63bd274e3f8f3/firisabetuxoguv.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1f03a556156274003067eff1dc6ea707/52539019205.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/55259833473.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vafifirope.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cp7bp2agpa92o7vsfrjlekb1pe/wumudefejuponivi.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/93991525485.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2amsv53adb6qb31oh2opeeo697/41118725974.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8eb226485---28886745802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tenancy+act+bc+pdfPDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10304 bytes
SHA-256: c3ec5090c80debbaea9ae2e630092896204003e2dce7794a141e789c98a0a871
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 18324 bytes
SHA-256: abb35f59e5bd88e40cff365f81eb0e3d8206e2b8447b7273353b927f67d9bf7a

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