Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fa315a6d418720…

MALICIOUS

PDF

92.1 KB Created: 2021-09-02 14:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0275d9808527549dcbfdd20681a3a189 SHA-1: 3feef1b64f7a49e91722a1c97205b7a2004049ee SHA-256: 55fa315a6d418720aa4677f7d70383f19972b05f76e8ee476a8b950e71d5c5af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=group+therapy+manual+for+anxiety+disorders PDF link annotation
    • http://mebell-city.ru/ckfinder/userfiles/files/lebomupixejuk.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f03f427bbc0746ffcaf755cc67a76619/fomedalewememagiramelu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60db49b2bd6c9.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/30977161684.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/s785lv3kdfv7ska4lf6o4n6p4d/kaxebupuzobefe.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/sinelonetofo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gopoxenalufemaveg.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/25274449353.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f89a96f15---35821981913.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/goredetikisifegelagevesuw.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/96450392181.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/l0pptaurit1hlf051kqhi53on7/buzagez.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/saxukujiponewosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d87348ed---kobupajufelofi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/miporusedinaxowipoto.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/filebarozatavotu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608584ed3f66b---zewejofexufijefej.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdaal5p03cu0odgvtbb0rnb9h6/jepazojenorukulapozabira.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pepimexateroba.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/nuzogizakobevog.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ec172302---rogapurevukuloxim.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f1b0df87a9ecd7aa0d6ccb66db59ae94/31838593332.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/jimev.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/50818076314.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/88009532854.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_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 11120 bytes
SHA-256: ffcb1db7a43dbcd68b68726408cfffc08e3decab8bf9a14fc7fe89ca3960bf8a
font_01_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 18608 bytes
SHA-256: 522fe43a75b6b6c32b431dbf0ab469a995770218b476f65841a31ed61624aad1

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