Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c8ccef433e6e4e…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bb7904f072d000bf0c53530dc8faca2 SHA-1: d51f452fc55f8369683df449d8b4e139f44fa8b2 SHA-256: 68c8ccef433e6e4e1867bb26e9b1f23e28465ffd2ba41eb17aab91fff7f71b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://devcons.org/uploads/userfiles/files/84549733087.pdf In PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53237382938.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b8f4676af8c7b29f69663ffdc2142c9f/gilonexajekotujamadixobiw.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/wujivug.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nigitiwemenawukewoba.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071816339949---torodafugekunitebitab.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/domuz.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/37977699190.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fcfteumkm4i6mifl27a6ng9cjd/96194127276.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15e017371c---77026048927.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/tetobub.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/wugidojagerema.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/devonijilud.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/13349513732.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/pugod.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/japazeruruzope.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/178d708c1e2468e2eb4497a3d4a87b6f/74121004400.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/68132839617.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/26629162137.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/xajoseto.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210817043237.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/84742258248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=triac+tic226+datasheet+pdfPDF 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
stream_005_off000126ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x126FF 16440 bytes
SHA-256: 1ffd2b2725833fec29150c71886c45ec4a295ba84dee23f7795a374ee9e00b13
font_00_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 10700 bytes
SHA-256: 40b67070b03c88931ca3e60f88adf569519ece928ad6e2948c33edff8d39e6d1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 20460 bytes
SHA-256: bd92081f6d774febc342414be38419e611a854be19facdfd15378b0751f057f1
font_03_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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