Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc2cac7590f14cb…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 08:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319ff15cc03a15af439568f5adbaeba2 SHA-1: 5b28dd9254158dc364065ad4415585816905610f SHA-256: 4bc2cac7590f14cb1d8a9e1292bb926959791b33e077bcdef4786463c9908caf
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 links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content or phishing. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b180086c4bf---bujogapenaxobapediro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb563745e3---84613888014.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a036cf6011a---vopetubutesafefixikol.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/kenidutufexajom.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/85023904540.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7d1f37c0---kinuxarixufaguw.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5mcdbdtsvi6ksuqg81iqpur7s/66730776577.pdf
    • http://vistobrasil.net/uploads/file/32954258122.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb716c8bd---4196896154.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ddb454cf---93183385178.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe4d89007---teduwobuwivusikurimogopo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8bae6f4e1a974640c9785821f8813aab/bajezik.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/jixetipigujubadofe.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/434cf4e7eaca11e6c6be52e9cfcc3c14/gupidimu.pdf
    • https://aduanaldelvalle.com/userfiles/file/sisaxubowigejederilemi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869759a0e86---mewajipopatawikemeb.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f7489f8d---29799068270.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c40d3c8ed76dfdcb6d89c6422033c8fe/xegumisubiduzof.pdf
    • http://cuatro-pr.org/sites/default/files/file/76985230752.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f8m1horqdvlk9j5asvvooa7cf1/61825466711.pdf
    • https://koratspring.com/upload/file/66103926811.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8743d6d86---88518694561.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=role+of+finance+manager+in+business
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ae959cc8---kujuxufisibew.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_off0000ed40.bin
82c79f457b141c437732e0d73ab2a72b1306a1990b544bed9d2a9c53b9f5735f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16936 bytes
font_01_sfnt_off00011986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
font_02_sfnt_off0001319d.bin
8e8d4016ad74539ac1fe10b82595751cae480ec608adb3e2e35a1b0d23c3a1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 10864 bytes

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