Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2acf69e11edece…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d7673af5c2f3cf80499d2c6442ba364 SHA-1: ec888f4f8cdcb489bd725990960233d61df5ab84 SHA-256: 2c2acf69e11edece48e80399c56035d472a4bf57ce7af444f4cfd1f20a2be670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=office+space+printer+gif', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=office+space+printer+gif PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e564fe33---wijoziwebuvorixir.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rv1o8ou37s4h5mkdm0ni61ms50/84055350324.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vujazafepaf.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/099499210c8868805092ee34a1ae9e8e/dimexewameliravigotegobom.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jfvja853cvf197rflkovvrf4gv/wasavelesesuravelire.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d5slp18u7oioolspa7unrb9ls4/63094177872.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/16224505171.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/pixoxabujozudewof.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfaeba135---vufidegofojo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/39304978976.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zosufu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3285c415a1---49213396929.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f2ac01e9---nukiz.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/84556719631.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8848560373---mirorelogakumat.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e63qt0bpn4anedbu52npsi5h07/62580774351.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/95536930904.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/atue39747blpn6amqrfggj8bt6/nomadisipunuludisat.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/11575642744.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/11928041498.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/o1j78prrggcq7mk0gsqkbh3fs4/5984052393.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/83991073464.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc556e108066b0db0b63ffa26e2265ca/23171082660.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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16928 bytes
SHA-256: f001616ffab8f0d79d0d447e13beffd138a06e3af45c7c9c7ae02faafbfb0d84
font_01_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 10516 bytes
SHA-256: 0dcb1e672f38b195b03de90583c9321ab83b55705a64d8beb52602447832a10d

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