Malicious PDF — malware analysis report

Static analysis result for SHA-256 0485451aed67a4c3…

MALICIOUS

PDF

87.1 KB Created: 2021-08-13 21:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d640aa8b1c99c2b600acd055595553ba SHA-1: 7da1c7e929cc1b48c7c2ed4adffa830be8a9c398 SHA-256: 0485451aed67a4c3de6d0c2d03f1b2ec911024b405c4e10d7a9763e9be41131e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to compromised websites, many of which are WordPress sites hosting malicious files. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=combo+cleaner+free+license+key
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a6fbbd0b0fa3a9b905c217c727787fb2/92764758647.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/kuxixanefetulu.pdf
    • http://pivotal-technologies.com/userfiles/file/44593408060.pdf
    • http://veterinariacasettamattei.it/userfiles/files/70133329973.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/gemakawifugafadowimos.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08f4be4da7---palobiruwebewinanelixuva.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/87b6e88f3def4f365be1c450b77f4b32/28891237160.pdf
    • http://tafgambiatours.com/userfiles/file/podanulusamunosodet.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072259dc39f8---kubejax.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09be327807---vatitogunuvexugosivebu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67458952f6f0feaff9f72ddce5137350/zipelad.pdf
    • http://amon-syotengai.com/userfiles/file/tobugejevavibuvikojol.pdf
    • http://radfordhsclassof1970.com/clients/878146/File/tedejiwizapibafiduwefana.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/vobufe.pdf
    • http://vencedor.coop/images/admin/file/gapafumiratejugidel.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9i9fknh6uujd8290otg68jikrk/98703929204.pdf
    • https://bawwabatrizq.com/userfiles/file/48790789060.pdf
    • http://travellightnepal.com/userfiles/file/vonadatipixozodebu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3c464a6---vifilinuwolexata.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075abc1eb528---domufiba.pdf
    • https://proartgaleria.hu/files/files/44328201198.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62407fcfa---tukowuzi.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_off0000eeae.bin
8a58ff4eb665c380cbd3dcbe99f3379220c427299865085a9477713ec738394d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 17092 bytes
font_01_sfnt_off00011b5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
font_02_sfnt_off00013374.bin
041309a18ec45669a1280223dec077e0ca55331b43f5e6f175485527e87b1a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 10776 bytes