Malicious PDF — malware analysis report

Static analysis result for SHA-256 e310a06c60dc9459…

MALICIOUS

PDF

82.6 KB Created: 2021-08-19 01:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2eaa80f8a8a56991e104ea5a7617ae5 SHA-1: 2b31af09573e1b103bad6de6f81940a4ab9043bd SHA-256: e310a06c60dc9459c0edb886ab65e7099fe29beea74e81c1bcf96267bc33ccf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://saraiaser.nl/userfiles/file/vozoj.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/79290975128.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0ee5fcba---3341708596.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a130be68bc1---15491970559.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210602170715.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6c174adb3---36223872690.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4382f02spka13ehhsfdrooka5n/mulewudizavod.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5isecqnq8ce1bq1aiqt7sfv7ej/lanajisuveraluzokadusi.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/91340008391.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/dizobemefavufujovitotavop.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad34c5c64c---vujovu.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/nusigirebamudafuwepus.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/fafokogamukelavogoduxoj.pdfIn PDF document text
    • https://2acontractor.it/images/file/kevazi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/gejirotufoki.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wezat.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1t3j6t4rvh3o0qfcuj7n9mslk7/wogapemopugobamobemimime.pdfIn PDF document text
    • https://viceda.com/userfiles/file/19974033400.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/30298992327.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/55535985472.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kouvggqfc5nk75gskeor3tcof2/baropinafe.pdfIn PDF document text
    • https://digireg.com/upload/49473947261.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/18858112190.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8cbb5d992---38838942912.pdfIn PDF document text
    • http://teifsepahan.com/files/file/virulokebaxuganajefup.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607af136c7377---vurodakenidewiwitawelofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+easy+friendship+bracelets+for+beginnersPDF 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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 11488 bytes
SHA-256: 5dbdad8be8cb09c8923d998681f04d2edc5224adc49ee60c5423e2ba84c2010e
font_01_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 16392 bytes
SHA-256: 84a6eedd71c2d81cc84a66cbda03b65d0edd8905148cb85ed76a4a0f95ae3736

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