Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f57aa9c816c344c…

MALICIOUS

PDF

85.9 KB Created: 2021-08-05 08:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79ae4fee0164692044bf5b99f011d565 SHA-1: 0419bfec25509fa99e22c6ded5c323ab835e6ce9 SHA-256: 2f57aa9c816c344cd65ebc5489b9efec4dbe252b62a045c9246e450191aa8d90
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nhactheducthammy.com/upload/files/rigowusegebonejowuwokal.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf536dee24613e57a499196eaf74a3f7/joparejubegulowug.pdfIn PDF document text
    • https://inifd.london/uploads/file/67280580165.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa1533a26---pobojuzefalunokixopajif.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xukezosoxinora.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wijiregemubisusetawi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/xoxukumixuvuribon.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/900b2b781c59d7f853897580d625c0da/navejigugefisuvikadelopex.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0ib37l37ug81t2bvcncvmld2cp/19350372448.pdfIn PDF document text
    • http://dgjst.com/upfile/file/digek.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091243412967---76464015208.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc5ce803b---44438291140.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/jatalubeni.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/2245536591.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/turamakanuzukur.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a942f076be---37997629215.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c5f618cd9---34592480743.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d90872010bc7405d35e2fe882e1961b8/3037183227.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/79d41adfe7b558fcc59457b11fe6ef2f/dapozoxogidikazadev.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sepoketelajutoboje.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/508e13faa76ead74c441dbfd23e9fd91/libigikudesemevabavowesax.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/34526134661.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616ee3fd50---35794475601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tagoe+sisters+songs+mix+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 17156 bytes
SHA-256: c4be021b4131faa17bcfb447ff00a45a25ad2985cff45fa64750e918042ba119
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 11056 bytes
SHA-256: 128f5b9d8aa1b324fb5ada760d2ff843491bfbe0bca5179e0839017f401b23c7
font_02_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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