Malicious PDF — malware analysis report

Static analysis result for SHA-256 3591a18d34009483…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 16:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d0379efa6fd8e278a6e8a2196e724b4 SHA-1: 040891976454937b8d554794d5f79aa66a70152b SHA-256: 3591a18d340094833fd632a3072f94dba11c04ef916b21a2da8c506faa89eb4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment, highlighting the use of external and potentially compromised hosting for these links.

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 https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d5ccc1de33482ceba9350d97f5c7fad/pusawumunibeduposuko.pdf
    • https://99shayari.in/userfiles/files/42570346599.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/tibojumekalegalivawo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084177943a5a---85814802752.pdf
    • http://anatolianlgs.com/userfiles/file/zusarad.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe915caba1---gadikozozexipofugi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070926f376d6---remuretexoxamatoj.pdf
    • https://stiff.pl/ckfinder/userfiles/files/2508138375.pdf
    • http://ligneus.hu/upload/file/82067010683.pdf
    • https://devcons.org/uploads/userfiles/files/lozis.pdf
    • https://alixdemassy.fr/userfiles/file/nodoxepuxoxax.pdf
    • http://crystal-lamp.ru/uploads/files/35273224724.pdf
    • http://derma-dts.de/files/file/kavoboba.pdf
    • https://bruceautoservice.com/files/file/49493569168.pdf
    • http://kursadowicz.pl/Upload/file/sezukutodiderixa.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a942f60d6b9---74883346102.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/natezunufizimedutabav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=passing+clear+mucus
    • 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_off0000ffec.bin
f30338975c2d1c6190d6cf0a92aa18653115d653c6c329b1887d096d392d1291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 17636 bytes
font_01_sfnt_off00012da2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
font_02_sfnt_off000145b9.bin
55dcb47494f1385ab10b21c69a306be70589b3e47d45b6d6b6765797c9ce75fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B9 10456 bytes

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