Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4860b1b3e69f4d…

MALICIOUS

PDF

76.5 KB Created: 2021-08-11 02:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49ff262c015a57ff1f003c7785a5e8cf SHA-1: 8b1a66d15b1adffa5c80855ee816047e24437be8 SHA-256: bb4860b1b3e69f4d622d8e31215d7162c47795ab2fd1408734ff53c7d36bee0f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://deltaguvenlik.net/userfiles/file/xikameluvukaponebo.pdf
    • https://immobilgold.com/file/lival.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ceb9e461---begux.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/qf8lldqtbhhjluj2crcvflmbt5/8992145490.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdf
    • https://menu2uplus.com/images/file/64411771722.pdf
    • http://automsystem.com/UploadFile/file/20210716000321441.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/2e7ed4357ac870fee6b888964fe43bfb/muzovofejemowusezenalo.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb74842f4b---gubevofukivajokudo.pdf
    • http://studiopol.it/userfiles/files/74034704599.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/69ca161893b4eae6c1c56cb1bc4b55b0/28622116766.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/wegivonegaxusotepexibi.pdf
    • https://sweetburden.com/upload/users/files/98375059285.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/28338168302.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0rdmuc7f87o5dkl9sprnljbkf4/xumavolelubaweg.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742326d9601---jiwexuzotoxekilonup.pdf
    • https://cplastik.cz/data/cms/file/40796758447.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8eeecb15a2252682419f9c62ee6b4fc7/84341308746.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07ec8b268---19221131827.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f608d5306---nenutonirajekowabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=everdure+brigadier+gas+heater+manual
    • 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_off0000c735.bin
e91b4cb28cda0a82e567f616215ea5163f0874d86545a9c43afd99b137fda4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 16304 bytes
font_01_sfnt_off0000f17c.bin
5b4b40b750eaa8e1cf5616f34622dc2a0e9f7965371f8cf49a442ca466331e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10864 bytes
font_02_sfnt_off00010a28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes