Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d5a297d2d9c4ae…

MALICIOUS

PDF

69.9 KB Created: 2021-09-04 17:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a6334114af348ba4d1d11937e24644ee SHA-1: 35dc4ba0cd8409dd927a762ce93abad9d26d884e SHA-256: a5d5a297d2d9c4ae650a6698c5dc198404c18f6c7f5217fd3b339543ee28c71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this PDF is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=ego+battery+charger+manual PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hqs6q3nd10k0bap6ut379evvj6/jibavelebujufen.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/simedilazavuma.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/70647314499.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/netizisonosevidagi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fcd6ca0f67cfd92dd60b3d431d3d6c4a/84289901450.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/78862731981.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dipimoxulujufamidinaje.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/zunizavoju.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/wuremo.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/64906243193.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/81171293502.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mokexutobux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad92623cb---balipisaxuzidojaz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rawonuwutu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/q7bcjfgg8moff9b76iu7747423/5942834396.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693a5bf46e---22289048418.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d6984d4bd026522c1af8ca5bf18abf6e/titunigufebab.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/zotegazujomajibup.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/5285995395.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ae275060e4e---96434963851.pdfIn PDF document text
    • http://lucann.com/Upload/file/maxugopisefelixux.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/pifijip.pdfIn PDF document text
    • 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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10752 bytes
SHA-256: c7c7117183d981a636e4ac5c74e957830fbddc616181c3e0b9859688b926ba5a
font_02_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 15452 bytes
SHA-256: 422326b5f4dc1bd9ba24963f3a12677e5729d071d200533922eebf88ad86d320

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