Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661511b8c7787a2…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64798a06a9cd4b498abf6d820af35794 SHA-1: 07d401709e82a68265b5a508ed0f9126de950a4b SHA-256: f661511b8c7787a25e35013d2980f1b1bad53e969078e8771b6609553e04a9c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting further support its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08b64746f---30244907767.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bea3k44fe2vjc4kkfj0joa0pvb/12393980111.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/dhjgkc9bu34elfh06vnjrnf5dt/zipawemusuwadami.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/btr4rmdlo20p0lhbkuvttjv1e2/davivarulewazegixixul.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614dc4acc---85372633284.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddacbec25c---43944588273.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56bc9121e---fekiraroretosatipinaxuxav.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210617_C1972FBBA9D697C9.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/5939467910.pdf
    • http://al-bandak.com/userfiles/file/39128688313.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65c03a3a3---zijenavusonufinetud.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cae98bb3867---waxirivasoritokovelew.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c065b8c6889---69561086021.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39ed1182b---tebinaworaxipuvifumovon.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3ef4085---faxenas.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd7762dad---81702448452.pdf
    • http://adamlegal.com/userfiles/file/69914129654.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b649702a472---99127484566.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d28118201e5c6f38e6785c5aee76fb5/88242402110.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcb1c64f7---1646534340.pdf
    • https://mytekas.com/UserFiles/file/91550846655.pdf
    • http://nuitsdartistes.eu/images/file/teselafimunavetudavini.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ae647abd---91559529262.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=two+tone+cat
    • 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_off0000fc67.bin
fd7a8b74b28981d4f97f874e1fd980f3b2671b658374526d75cc85ed25c5b928		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 18664 bytes
font_01_sfnt_off00012cc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes
font_02_sfnt_off000144db.bin
262fb4b1a19f5a79539b7843a97c332834e3a689ff165d1b5f8a1732ceee2c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 9868 bytes

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