Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ccc7632c4b351b…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 21:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47332e53ea907d3f7c985408ad30b6ad SHA-1: 8243c065def0ae5cb93f1f15c50ba385f1900c6a SHA-256: c8ccc7632c4b351ba853a0be47c5249620a4aca2e68b0acfa47866295c87a206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users through search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=what+is+the+best+place+to+find+diamonds+in+minecraft
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609490bdc313a---rimoz.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07690f500---bisejiwor.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9d546ceb414ad7c083579723ab577a51/bawexiwodikosubivoju.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8738e2c630---wejekipatanukododewe.pdf
    • https://usssecuritate.ro/userfiles/file/zowip.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/78852456712.pdf
    • https://associazionedynamica.it/uploads/file/gewinel.pdf
    • http://adabaskimerkezi.com/upload/file/lowijesur.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/77c8661c4697c4f7579db9317eda53f7/wedunuzuvuzuw.pdf
    • https://10glazsikeyrosa.ru/file/wosewogijuwapavedogon.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/29992a6c74b37ffdfa8567f4398f7ce0/74907836004.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c676c1b3dbe---58930924284.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eee28ec65---kezebawo.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/jisap.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/377664fc5e60c7985968682e60589448/69606443521.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbca99fe7---kevitanexarosofek.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/11361893847.pdf
    • http://aarogyamedico.com/userfiles/file/pilisaxekan.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49097452ccd57b333241730af36172b8/sutinoguxe.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/pusaditujudejavuxiwi.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7c67f6b24775b85c7b44b1d8d01b592c/6169228638.pdf
    • http://interiorconsignments.com/media/file/28021941760.pdf
    • http://asijskepotraviny.cz/files/file/jujovife.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd10b9759a---71060888597.pdf
    • 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_off0000ec55.bin
658acbbb8233ee47a4f4bb67e9dd0f7d019296e89232018f3a047cb60b18a4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 18304 bytes
font_01_sfnt_off00011c26.bin
4ab6250654cdc2569853a5fe005785c2d55e0bbdee036194e922d1067c526e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 11016 bytes
font_02_sfnt_off00013550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 16792 bytes