Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53010dcef56b6c6…

MALICIOUS

PDF

89.4 KB Created: 2021-08-10 06:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddfb20874b8f2793ff054a7c74b8480e SHA-1: 3e9e7ff09a112cd502a6c6b0c62a5b58ff1c67be SHA-256: d53010dcef56b6c696c920c06ce86961a5b7773eebab5e12ea00bb84f9cc1995
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://agataklimowska.pl/userfiles/file/galozari.pdf
    • http://np-laser.com/upload_fck/file/2021-7-2/20210702011715345019.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b398b8ee---36188792216.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160931fbd39d74---67792863068.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/857e770f81bc4b929af912b28e0d6557/4937224070.pdf
    • https://fruzsiflame.hu/userfiles/file/90629429986.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded768b9f---28630754625.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1fb13aa2f4ff6e14b3525e3853e05efe/pixiduxob.pdf
    • http://obraz-tlt.ru/userfiles/file/tuwafa.pdf
    • https://leuphuotcamap.com/uploads/image/files/28142701207.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l0qpl3sd9933lenoq9k9brjmsm/gabekajofixipuzaduxu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b41da896cc5---bojutufepa.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081212b0ea23---vuduxeted.pdf
    • http://king-pro.com/userfiles/files/60449264754.pdf
    • http://sacmacbook.net/userfiles/file/rinikunutelapi.pdf
    • https://swalaya.in/userfiles/file/16898960382.pdf
    • http://worthingtonpark101.com/userimages/70803183008.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/gavafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a009ae93---mowabejukosar.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d1ed7c4c---67547975323.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06855ef6b6---30624372800.pdf
    • http://abwlanham.com/uploads/files/96214070211.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/xafuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=seigneur+toi+qui+nous+aimes+prends+piti%C3%A9+de+nous+partition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51d.bin
29aa40012f318aa189ffe3465b21317098b5465dab3c697c54d6ddfa09525fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 18920 bytes
font_01_sfnt_off00012342.bin
55a75e8c4110caa6de4d05f874eeaa33bce35f106e4a2ec4e628bd1b93ab18c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 11164 bytes
font_02_sfnt_off00013c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 16792 bytes