Malicious PDF — malware analysis report

Static analysis result for SHA-256 233145c942641735…

MALICIOUS

PDF

84.7 KB Created: 2021-07-28 00:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44da3c3b0591a3a7b59ac6bf3af4f4e7 SHA-1: 71cd110cace382ea4bf338337b03ba482e1ee9d0 SHA-256: 233145c94264173505a082bea3f39bffb56c98a39952cd65ed2e2ee5aa4099da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ggmtc.net/userfiles/files/31143927827.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/dc83cc717e3fd270d1b4342a566e3681/64135504037.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b9821f2ae073d6557592268248ca258/55914798071.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0fcdf34d7cb297b8432b2e1c24547457/81409739051.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/84711303699.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/fb1657abc4634751962cc1a441568b1d/buxopuw.pdfIn PDF document text
    • http://klpa.net/userData/board/file/66193553106.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/10960080441.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/752dc4fa6040dd5bb061b7a5a4dc9ae5/43229434508.pdfIn PDF document text
    • https://menu2uplus.com/images/file/68120982604.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961d8e2ed6e---tobewura.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f572447b---32214695319.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/44666158549.pdfIn PDF document text
    • http://drironcat.com/images/file/71449842437.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/59829666860.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/90844231918.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb43d13c6---79717568072.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ea36892b---17079227236.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee36576aea490e48cdf51e0b3070d423/30525737669.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094318f47e13---48006419410.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/94064440169.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8f19682466957c0771b236dd4f697fb0/gimisorebaremuj.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/50140285099.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/64254715294.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9fa72b03---29390388624.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f878d891f---77406430125.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8715d7ee---49444471082.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/daposadomumupawolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+devices+support+pokemon+tcg+onlinePDF 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_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 17180 bytes
SHA-256: 0bd21b66805c93fe31dcd69c267d3b316efed567da80b5daaabd24974fa214e5
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 11212 bytes
SHA-256: 3add3ad804a2ada86ed917b047fbbb1be1e39a936af6434ff3cc8487b840492f