Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fc3a221d60f957…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb6474f8eff39327aabc737b9d8502d0 SHA-1: ca6b29dbb2ceb6ab576c053f2a74a6149dfe34b6 SHA-256: 40fc3a221d60f9576154844c19f4cdccee7528621a6407deacaba86a61756cff
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing unwanted content. No scripts were extracted, but the structure and URL patterns are indicative of a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=proportion+dress+design+drawing
    • https://koncnc.com/genelresimler/file/23775714984.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/94dd36185fd1271826e0b69d083a7329/62676398128.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b858c5ce1a085840c5d72501063f34ae/12565841245.pdf
    • http://studiosaletta.it/userfiles/files/wifugunenagenavupobo.pdf
    • https://majubesar.info/contents//files/fazuzebukomodisajakoluzat.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1930d2b72---41937001527.pdf
    • http://ksnjl.com/userfiles/files/89386711644.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k2cvq03m28u16ki7g6sps6ids2/selefalogasuneva.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c84ffdd155c6ae077ef9a9b10b4820a6/11538853394.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/782b811adb1065f43967785ad4207f3a/barowem.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e24b11b4be1e008f2feec8e582d222ed/bexoxivizexadaxotisowepos.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f3cf59ebf083d1b1135c03537cf1a516/70999861071.pdf
    • http://extracam.es/app/webroot/arxius/file/vupejuxugalefad.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b284ec32---vivixeximug.pdf
    • http://computer-rudolstadt.de/upload/file/kaxupepakotonaxokuvad.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/53379511532.pdf
    • http://abc-tel.ru/data/File/pinijofuxuridonises.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/rikitosemuvejakes.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/300e688de68ac10a718f9c49572844c8/87434159494.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77ed13b78---53036225409.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/a2b57983f6ed7022db0dced021e61d48/5993167289.pdf
    • http://kbchina.de/upload/11295686488.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b581e049---fotedulezusiwi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69ceaff90---11889199778.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_off0000eb04.bin
38a23ba62e1a93f5343bdecc03ce4d80753827e064dd759909eea032d69570c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16976 bytes
font_01_sfnt_off0001172b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 16792 bytes
font_02_sfnt_off00012f42.bin
e6425b907a893be10829cc6f4fc5577fb5ace90e4fefcb520b536510d774b1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 10608 bytes