Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f34a2519ef4c640…

MALICIOUS

PDF

74.7 KB Created: 2021-10-08 20:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b775bd7a0d4323dfaaa73b5c2214de82 SHA-1: 4cf738da8caca67ea580514cb58a7ab053aa785b SHA-256: 1f34a2519ef4c640664b63f787744ff122b317f2a094e7bb158702826740bde8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lhorizon.ca/uploadHorizon/file/dodevevijutugugudofifow.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/lagipetedasalaxixexigem.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/61688646649.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb65406f79---dudojiru.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nugolezemafugopap.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/vanerifum.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/97445735368.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/janejobinixeneninoxuk.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/21178609437.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cjccdpic23f542ko2g9pul39kb/69458474837.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/24544175757.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/narulo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kodowutadawikejasatel.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141109707d9d---bofobuxemifegokod.pdfIn PDF document text
    • https://norservis.cz/files/files/21410793036.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64139600894.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c208f5b8b8---riborovozu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/92980483327.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/jerizabisodonisa.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/gijitam.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137b69716b57---gasikosozogem.pdfIn PDF document text
    • https://brukspec.pl/upload/file/sisunawagoza.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/jeboxetuxivigawejenovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=definition+of+the+asthenospherePDF link annotation
    • 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_off0000bf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4B 10412 bytes
SHA-256: e44eaf8837248d5d766ca401d10d7e2b3536021b8f7c517232e1480ce73af753
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 18252 bytes
SHA-256: 6d3595ca1a030eebc91cec590d4dc51dd36fec0acac901203c27c966a8229e70
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1