Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd94d1b3d2c05c6f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-08 18:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0865ab2cc2259c9c14d86a37e0a03ccb SHA-1: daff69c6be2f09c8d5ae97f3cc186040e170fe81 SHA-256: fd94d1b3d2c05c6f81d0010a9b18e7d6ce89b9ee7061ac7f032b0fd195c2ae75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb0c84111a062b50c7ce8c9c7fd64e84/67104187983.pdf In PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ai7m6599s971uhcfdpjgasdc49/53521135930.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093045ae8cbd---96912814189.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/nebukarifakite.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/dofekit.pdfIn PDF document text
    • http://come2menorca.com/images/file/81088091046.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160766c190e267---32794674254.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/75152308800.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0d9dae69---89371097936.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/46043806879.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/81765115019.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/danowosax.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e78ae2da63b---xojogotowulabawezusoforuj.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/41791384238.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/751a9598f71a1ef3401fb99839fd0b83/wogozo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/93344853020.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160773bd7a3ff4---xozofepuwa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36dfcd205---50026104615.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/dusodufiroximovebigujid.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160773847c1acb---kojesabafirapo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/masozot.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcf542d445---buvilebawemolotufeno.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/31821406317.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/40343832911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=car+parking+multiplayer+game+mod+apk+downloadPDF 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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10988 bytes
SHA-256: 5dadcfd646c4a87c5576b6da68e9c978da98768c0fcc0bd05004531d159c91a3
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 17988 bytes
SHA-256: bd3e7283cbf4235bcef7a4c3c6b3f7cb68e94be6e0fbd8725fbe57f6e65554b7
font_02_sfnt_off00013666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1