Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bb83eed83d30a1…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 14:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5dcb09f1dbbf72c32917b7e73d837134 SHA-1: bb1908b213c263452540d950d6deb26da41e09da SHA-256: 56bb83eed83d30a14c41411f8f0962c4fc8924ac82d930614e1215ca5fd17b23
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and URL patterns suggest it is designed to lure users into clicking links that likely lead to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7bcca84489697141426ef7dc33cce54/60099351445.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j6epud2r2froisoa5b825iv587/dusebipilozami.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d5d448d0442a1a294a51248fefe50090/80992401671.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a40175072e20c65cd872150d824bad5f/45454319289.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f34b2b20---nixowaxuzukazaxupuzeda.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/34558d1adb5e27ca45c815c50c668621/vutuderaru.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/lojegetinivafivadi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/buxifofenu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd428e3f276---40119990351.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5d0237eb---50267320234.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/db462fd9999ead6edd6c91373b30d55d/5021612911.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/jixoz.pdfIn PDF document text
    • http://xsjprinter.com/d/files/68169604375.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075478ef0a05---12151427825.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8l9q0vh2jaghuchrle0cl303uj/97052538107.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/68ccc7f9eb779ba2a4498080db818355/negeribijijafe.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/66770374368.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160836be8b2410---tusokogerezipeg.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e6a5771e---vovomevewitoxigefizonani.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd10992ce---laselugibiwiwofifusiwubiv.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/61536279686.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fc0b732d5d51269decbe3d7453819edc/25986313671.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/22057873651.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089850193e28---punosemuz.pdfIn PDF document text
    • http://getem.pl/files/file/43109073059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=incubus+city+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10424 bytes
SHA-256: a36e5c35c5a4640ec3e08a039be29acdeda060a6ed05db35c6a2329d0d80161b
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16828 bytes
SHA-256: 6914be611d7acc6798be9b33bfbda2fb31926713c8e524550d9e5a3623eb8df9
font_02_sfnt_off00013a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A31 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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