Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325cc7896c12bdf…

MALICIOUS

PDF

83.3 KB Created: 2021-08-23 09:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f854dbd7460a02d36f8ade3ede7045f SHA-1: 74c22dbf797914a4706b6d998feae956eb7bc4fe SHA-256: 4325cc7896c12bdf5a14b05089b6328cd194ae1e48e496c1d0ae169683fc4c68
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6g1pasea1e5k6v05c3nhftdtp7/bagolafemikowipelususipu.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5d8ac270b---59428908075.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kabukugomasikizonud.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/7281633944.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ed07cafc---makoxapesulupozazij.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c51c75f6---79162459776.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b249ba9bd9c---lelok.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/6439529106.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/sazixis.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c43c10c3a0b25303a03652d10208f61/96602980593.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15f4de5a---41734937697.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d75e741a4---36467194740.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/84156881692.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/nazogurovepusolajiti.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/82637013154.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/61561575641.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/gowofosujubarukenibi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/80012196847.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3m32ipfoma1s8g02l47521c04j/37569691125.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/23475307795.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/movup.pdfIn PDF document text
    • http://caramelitos.sk/files/26678521618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=1+lbs+in+kgPDF 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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 17844 bytes
SHA-256: 979355bb2f0bb38c25120f035508225a29732e88e6a07a28ad1ca7d0ff3fee82
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 9860 bytes
SHA-256: d54f687469d8fd35d70353cca5b1a5f786ea3d54282420f3454be5f49d0ddd0e