Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd2c4c13b3a8c55…

MALICIOUS

PDF

94.4 KB Created: 2021-09-07 13:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 302bcd4c4cf7452c20c63a4d06cb398c SHA-1: 1d0b1aa3ee91bdb0d57002ba83557daaf26e1b57 SHA-256: cfd2c4c13b3a8c5525688e729981be5c55a73bfa75f3a7dd15c9ba1229dd8424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://realestatemiami.com/userfiles/files/81953722055.pdf In PDF document text
    • http://folientastaturen.pl/_data/file/ravezogutig.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb1a2ab18---bugapa.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/kexomumomovolovunipaz.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/lorixajogi.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/fbcd660d59472657878877d613421533/49544600314.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04169a2ea---depanefutozovo.pdfIn PDF document text
    • http://portableandcool.com/files/files/1982421992.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/tamonegibuduwik.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/41352857977.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681d12018a---dapiwateriwobok.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/milixobigopojegeweke.pdfIn PDF document text
    • https://marigabung.com/contents/files/94028443978.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/fesijizokefidapoz.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wefuvobupezopedibim.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lufawanu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae683fbf066---teduwinumodomis.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/rebofinoxix.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732fe17ef6---posiwajozenakamujakowi.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/80938143191.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/42164119966.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/75087025976.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/91608446790.pdfIn PDF document text
    • http://caramelitos.sk/files/nonafuxujofexizaxalatusip.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/6334798313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=find+limits+graphically+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 19412 bytes
SHA-256: d89881d2bea643080b7382070fe96ae48f2d4f149e9e6a97fa0c97db6896ec70
font_02_sfnt_off000151ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AB 11228 bytes
SHA-256: ce87dd56449392f0fffda2d38b49f41c94567c8886b7cc17a100a16376e7f549

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