Malicious PDF — malware analysis report

Static analysis result for SHA-256 6391900d4c90604b…

MALICIOUS

PDF

90.6 KB Created: 2021-06-25 21:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4d77696a319c1e672f0f5c5d0819fe2e SHA-1: a65b2005f662cb4580cd70982be8c523998507fb SHA-256: 6391900d4c90604bb28166d83636092a13e39afab007e70b6781da8c9e2c1de3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous links on disposable hosting and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80f041ec0---94219553894.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c01d852c57ba279e29984f647dde5496/84562149591.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/64163275942.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a5df34d41a90f62a383a25e622d73b7f/88077755140.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/8505695952.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607210402dd46---sizirufewazakifanebujegat.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210610_739AE31C1108E609.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/743444cc467acacdb128109ae7a89ab5/22218409933.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b157e91f4f---46123121520.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9203c938415eb1e3801270f91e0330f5/95630778737.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/wanej.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fc95aa40---zifinomerez.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404552dece---pomot.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/1535859797.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d313f16322f0c14c3cf4e35baf61a0e9/vumemumusuxazufafo.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d8ece146deec3fca9d7701200b017543/92236407502.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vk3vufitdsmiikne0p2nla92he/94352935492.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/75631e2a8ab1d4b9ccfd54709a7aa6e8/11340024489.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/nunifuzefelop.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/18985850839.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/19729137827.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb8cb3dac---9188068305.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ff55c1464c20d309ac52201259cb57ca/regomop.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zaperi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fogaforilojulexuf.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8104859b---33347659628.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/778f2ab3cd962d6c348ede54f372fa8c/56414868264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quiz+questions+with+answers+for+childrenPDF 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_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 11024 bytes
SHA-256: 49872e79ea4d574c04d604e32c64924c1924232c27312bac01407825ad61612b
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 17276 bytes
SHA-256: 3c3eabb5fb6e17a3c81e73c1c1fed706df61a59ffa760ea72fe3ebc73cdd7f6c
font_02_sfnt_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1