Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ccf367a0e5ce5b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97236cb53b19d643c31ad772f3964151 SHA-1: f342f1b2398c49e5b2d3e78211d79a3e66c8acc9 SHA-256: 64ccf367a0e5ce5beb589eedf0062885708add55b8afc01ed4cecb954173be35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing or malware-hosting sites.

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=english+file+advanced+third+edition+pdf+teacher%27s+book PDF link annotation
    • http://standardamulet.com/files/files/nukegagasak.pdfIn PDF document text
    • https://hoongnau.com/upload/files/34371713530.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/70455334943.pdfIn PDF document text
    • https://koratspring.com/upload/file/59853007035.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f9107c56d---foladetewutabiferinat.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/caf5a5b1cf522bc7d952a3bd9c611834/ninalamupuju.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea5f92d45---sagezu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/konuwurepa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g22ko1gcsllu5236i275u414r2/95013294424.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/mekomagizovire.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9218162e---fepovumozuduxelewanu.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/81847963111.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/55buabdv6clvs3fi2id4vir2ho/25538722029.pdfIn PDF document text
    • http://risme.vn/files/87468327752.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pijajatefobeginolesixez.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/65980360930.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ut036c8q26csjfpdr6q6d86v7d/bigeduwapotum.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b165d947ab0---logasikejisizekudabexud.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/vedapakexevib.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7ef66744c7c196995dc833231249a030/loxufabawagijofunoliseje.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/83200977452.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vuxovodepuwetosuxijazig.pdfIn PDF document text
    • https://profesa.net/userFilesfile/dufofuluvuponobetatorake.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ghi9racjpvqa67j2q8h4qubor4/lefib.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03c5478e287893e9092d966c395aa4c8/49804544069.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 11216 bytes
SHA-256: 5997c9a1b0583016e57240275da7551721ba26284b6263597551012ec5f92e5d
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 20572 bytes
SHA-256: d09ab9c08358f394786d4d93f667886340e547242ce4724919def0eb70584bcf
font_02_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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