Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd63daa4fd26972…

MALICIOUS

PDF

79.7 KB Created: 2021-07-29 20:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8781b33fe8f7a46a27b6cef24326b9cf SHA-1: 1aaa058b06743d4832e119f4fcb6b415cc8ec918 SHA-256: 7cd63daa4fd269728a3b29b4939d8b1da176007bd1ad863b83ec79d1332d83ae
124 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. This structure suggests the file is designed to act as a link farm, potentially for phishing attacks or to distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=bomfunk+mc%27s+songs+list PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c853b2cbe---fubufuzofumizirukavur.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/9664019845.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/jutizukebigurelafedetejeb.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/jejawixotapidavup.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/fabuxazijilitibom.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0250029560---49146243466.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3955a34694---sudijoreduj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3cb5dc87---4911408850.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/95350176796.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1b1692964d5c40f44a25b0b294565328/89477414777.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7hoijct5cbk3ceu0g4tjis704c/63996984638.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/feligezo.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/25403679838.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd59b12a4d---74611761407.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/5300577309.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d53848d5ad6---70839932133.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/89de51683282238902698629e2948a64/18807725084.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084afbf74a59---ruzejadevuda.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/835d37b90d29f7fbf60f2bf31931056c/57899636276.pdfIn PDF document text
    • http://unseretochter.com/images/file/jozezebovo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072014dc7648---lugajijaxatugabufudabenif.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8587eb6e04b1dd5547ca020c62e790/pavowoxawipiz.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bkks7oo77u6e129p3em4mh6m03/52680096300.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 17452 bytes
SHA-256: aa37542bf60e8dd494b761a2580b8e5d3990dd63741e9f3eefa3dd159047ab3c
font_01_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 10564 bytes
SHA-256: 7811c2613e3f8fa4850bbad4fce588c7d6a0420903e859980103c39cbde4b49f