Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef32839ed91dd756…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 15:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 374233d9f356935815b4ea81c3806350 SHA-1: f62ecb6763799b22a9cfbc689d6f11382a1f7a55 SHA-256: ef32839ed91dd75683ee3b8fcf909bc709334825927f7bfc5070f54ada0b5d5c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which point to external websites that appear to be compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

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://nomylo.ru/uplcv?utm_term=lyrics+september+kirk+franklin PDF link annotation
    • https://chameleoncoupons.com/adgprocessing/uploads/files/roxejobadupaguvositifolud.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/1832022498.pdfIn PDF document text
    • http://katachizu.com/img/news/files/31190352964.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/84869814810.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/58273892462.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/tonane.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/56889635173.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/reguxavaderoforajina.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/78492297291.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/pebexig.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/femirusisavuw.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/19217682859.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/1324404037.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614042872eaa7---bubijifopebajivarokoses.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/77907002356.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bb303fa82a47afc0745399cc0484e002/16890269447.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/11458587969.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rigupajawot.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/747037e051a27567be6fdbacb91af74c/86008585204.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/sarun.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/30119857080.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/31045863106.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/21812604145.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2c7baa06---rilisuvuvasojexefejitu.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/85687956260.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/15399611813.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_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 20456 bytes
SHA-256: 79430746b751d83f19ef4a62b064beeff8f953126f0c4f80db4f1cc93b39d0df
font_01_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 10824 bytes
SHA-256: cd4e06720794a7468aff02fb04fb653d8d66eeb0ee45f68ffc8c1e7d629f86d9