Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddbafa9c6d5a6b6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-19 10:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f91fbf200818de4d86c3313823d8e90c SHA-1: aacb1db459bcdd659d33a633b750e4d2cca5dd71 SHA-256: fddbafa9c6d5a6b6aa5445fea8b702b06b643959814e8f520289872f02a75a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://advance-pack.com/editor_upload/file/36396901538.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0e684b24500a5a36a2198ad0c79cd547/34111336445.pdfIn PDF document text
    • https://eslms.com/userfiles/file/57023195910.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f74b74a564319a7efe55747c625bc003/79045532606.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d228630ee---25930836249.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatusivujegiz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27e196b9c---2960623915.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507cb832be---vovofeduxosibajivig.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vamowalukutuziwebitada.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dezolero.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nogegapeleletofu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/posexirozimejarilukan.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fc7353f8ced79cbc1f701d426c95828c/kafuvitazokewine.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sakezamituwuzalasikabevu.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/45674316742.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p05aqftectptnhap9a90pb9uu7/89102314949.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/25831920285.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/100924d3aa0488e4d8eced9590f01340/76825972241.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925439ece98---zedewexanukezenejuve.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5c472419---29449613906.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/42680908886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+escapist+2+free+download+androidPDF 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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10884 bytes
SHA-256: 534055679e8c49f33e49ceca30fc6f106a556ba4c84cd71347bb122790cb72da
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 16580 bytes
SHA-256: d4c36228bb1b55a25cbff69314f0ced6d1be4e1d04d611ede40747ee07e76a4d
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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