Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a263b36ac06366d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-08 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 634054ad705e1cdfe35f2e30d8410ba6 SHA-1: d4fbfb5a6653dc11ae2faf025049a5df28214e76 SHA-256: 7a263b36ac06366d085f340e8008953a47d8ab281cde8045bf163250c8eedee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the URLs and the detection names indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://archism.ru/uplcv?utm_term=how+to+eat+fried+worms+free+full+movie PDF link annotation
    • http://zulaikhatextile.com/userfiles/files/66938502634.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f586cedff5---xowozalikemejularakan.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/5305591437.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f2e9fc826c513ff38f61b4ea4cb2bce3/75797371741.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/nominomaluvamesisufo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9p6otn2clmoegl7s5n080p373r/durujuf.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wivez.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776413f2434---90804514459.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab456265ee4---74131666746.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ruxepo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5i02o57tao1fphauagoeksg6b1/3322533373.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/tesuduwotulimagozuzuponi.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/walisemoxiso.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/sapaliselukatabufizavijug.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4549ebca---pebuxexogep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f02a515b1---22523872365.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/fuliwejez.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63786aa9b0faa278c41a1ec51a2c763e/86096685322.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b28409e60ff---89639996732.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dca1459be---58041171182.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d876036f---miseram.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16388 bytes
SHA-256: 142fcd70e40deb105e986e492c3e958bede767335300b66182e6d076be545bda
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10652 bytes
SHA-256: ea726e7653323e77ade240cbe6c590a52f0b46fb8019842dd9fae166b13c81c8
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17004 bytes
SHA-256: 1433fded29aae041a3fd2a7c201252c8006738d9b88bdf90fb1975ecd3ac5d65
font_03_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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