Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad319c34313f82f0…

MALICIOUS

PDF

81.1 KB Created: 2021-06-18 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b21400b36cb748c72679fdd98dcb681 SHA-1: f52541375d5c68cf76c900915db0761522177e97 SHA-256: ad319c34313f82f0f4c73f6abb5374457fbd12e76a5b8900a2905eb1d81718e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://normel.org/files/upload/file/wejixopagajoba.pdf
    • https://codecs.roimages/file/76244743161.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ddd4d3ac461d3c5a3b2b9494db94b1b9/74368991268.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21987c424---53666559516.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a918000657---parepebuter.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/38545677161.pdf
    • https://istanajpdua.com/contents//files/83575920778.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb5d28d70---vanabugiguraxalino.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4faa37cd6---nufedezafuderonaja.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cecf82a2a4cd120d3065213d5b7904e3/49156938353.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/gifurasasasutavozofov.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01ad8e0c---20300049039.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/dq8nb0gbv2c3t3snej7826dvo4/silufudodazevaj.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608970fc8695e---66186679705.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b78b5203---jomapud.pdf
    • https://ttraff.cc/wb?keyword=abraham
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=le+mans+assetto+corsa+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f557.bin
0e8ea375813d2951bfd82e99674777a07797c51bc3ce27ca30cb1fe74c0244e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5120 bytes
font_01_sfnt_off000106ba.bin
a588fd78dae247dc4b37905064ed71f76296586b9a1488f0b157c2e39a3d5436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 15520 bytes

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