Malicious PDF — malware analysis report

Static analysis result for SHA-256 727c11ee22a0f24e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 04:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd484601fe81e98ba8de2804a7e2483c SHA-1: b1269936b9ab8a9b0af0255ca5c417ac296ded85 SHA-256: 727c11ee22a0f24e9f53cacd3c1ce718c7816aede344e4ca1463b0ddf80d91f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised CMS uploads and disposable hosting. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery. No scripts were extracted, but the PDF structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=is+id+a+word
    • http://chretkinia.pl/userfiles/file/20499067422.pdf
    • https://niboparis.com/upload/fckeditor/file/1630594252_1.pdf
    • http://autoscuolapezzano.it/userfiles/files/50660229909.pdf
    • http://roocenter.ru/upload/file/69432504740.pdf
    • http://www.lovebliss.tw/UserFiles/files/godudipadujomopabam.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/dufowoxitev.pdf
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/satetovatunivikule.pdf
    • http://home-hj.com/up_photo/file/veguvolifadowe.pdf
    • https://bnovum.hu/downloads/51633361664.pdf
    • https://pharmnet.cz/ckfiles/files/files/pejojewivotilu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/2385723048.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1d12d8e0---17327942653.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/4165981114.pdf
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/mipimugojureminitit.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131497e93985---66837220105.pdf
    • https://ripedesign.com/app/webroot/files/fckeditor/file/rasusipelikoriwunolefaj.pdf
    • http://kodemari.info/data/files/kekuluvemelevuriw.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/10141605887.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd8f12792---18451981285.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210902_100603.pdf
    • http://restauraceeverest.cz/userfiles/file/nawifonaxajebukurimav.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/99341075361.pdf
    • 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_off0000b1cc.bin
72fea957e08e09686886fea0781b49998e3563b80fb08303375e558ebbb81ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 15692 bytes
font_01_sfnt_off0000d9ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16792 bytes
font_02_sfnt_off0000f1c1.bin
d4a8ab2b7ad799a65529455e0ad844aa63919e74a3b687954ca35bbe7b195f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 9900 bytes

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