Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6c141de8066616…

MALICIOUS

PDF

78.6 KB Created: 2021-06-28 06:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08cf2bc1020ec20573ef4e6bfd26450f SHA-1: 459d32766d8a14a6cf6df2aa00ceb134e663bf4d SHA-256: 4d6c141de806661606874277a060231711d99e7380939f3bcee0c3091a56f9ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic firings confirm the presence of external URI links and link farms on disposable or compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=vincent+fingerstyle+tab
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cb945fefd8528919a97b9837fad02321/72326657859.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sodedopal.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfd39b7b5d---68444232120.pdf
    • http://konyaozgunmobilya.com/userfiles/file/5770340784.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/kuvoj.pdf
    • http://botosani.ro/img/uploads/file/zotakukovewatukori.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f52cfa4bce1d51a963d8f8cb36ab6963/38045314390.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983972db0bd---60382504833.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26237e402---78516600556.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/u8m8knop2somsgpa9ab8ka5d00/gijani.pdf
    • https://synersys.fr/contenu/file/76341205329.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/6ace153b8684c75f70d5e66084ab6dc4/77841403665.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072799f2e9c2---vukamajuxonov.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a105c417e397452cec5d102877bbc1da/ragupawekizipeju.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/uqsc8lrgqrsovl14ki6s72ruo7/pebirajegogebufag.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3daaa438---jelinaxakozezowofifaj.pdf
    • http://alexhoffordphotography.com/temp/files/file/vebujelodelatab.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609defeb889d2---74748422926.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7ce79643bcdb34700d9341ad99892ca4/48107103734.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0dd774c71---80598509533.pdf
    • https://tolgyesvolgy.hu/userfiles/file/doliduvotefupadavuvef.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072660abeef9---lidurununabobadelaxat.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/852e4b8dd1072e78d4e5046279cc0406/fubirolupibugegojebumu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a28a6881f---18778336627.pdf
    • http://cementfeet.com/userfiles/file/mamitut.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_off0000cf9f.bin
245d52e8e7d87d67723a86f0400cf6636153306d6e0fe9cf3567ee593eea5c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 10616 bytes
font_01_sfnt_off0000e815.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16792 bytes
font_02_sfnt_off00010027.bin
47b2d7509c9ad47cc53d8ef68cd4a8b0d9f58486bff9487b15e12332579a4d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 17068 bytes

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