Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fd9dcb661accc2…

MALICIOUS

PDF

78.6 KB Created: 2021-06-30 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf5f2d412b3ac2c65728be5b2f355990 SHA-1: eaf1fddf2f251b9fc3a69a0819a68fe5438b6bb7 SHA-256: d3fd9dcb661accc26a066d01f5562c5d343241a2a14ee28343d5dc57a1f8a4f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sailstudy.in/ckfinder/userfiles/files/masubewopogur.pdf
    • http://harchovyk.com/userfiles/file/poxevabuwuwirasitapesuru.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/xoluvilomesigeto.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5b82c02157562f21f7489500cc06bddc/17956461881.pdf
    • https://abofahed.com/userfiles/file/9911744438.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9tamkh1e1m324gm2qim121cane/tejosegixolutovil.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kizubatexav.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef356bc9a---midugusesabedimol.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ebthi5u2dm90pl2jgt6idrfsta/gisaxofarejemezogipu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/q92iurv98dg0oj817c48t40525/93927833838.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m5lm6rq0hp5urhrgsamh88lg27/98265520362.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/a2deat64qq65808n9utug094j0/90112288070.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47ddd89c1---barolavadumer.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5456bf341c---fezefisilijosatugowuxel.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/04a91db88d59eb423225ef5f7b6431a6/5697116946.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/popofagedezemunepape.pdf
    • http://dansecyr.ca/pdf/file/16609174069.pdf
    • https://ctsgroups.asia/images/file/rifebalijogufamefimifidi.pdf
    • http://presssimayeshahr.ir/pic/file/67071688872.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b148ec8d73fbc8ec5b607f6c39004a86/norew.pdf
    • http://inventory-acepipe.com/images/uploads/files/5794972333.pdf
    • http://richfieldhighschool1969.com/clients/868116/File/tatoberewalutipolud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lokicraft+download+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
font_01_sfnt_off0000ea14.bin
5430f48cb478795e0f5786570e4f82909f98ab7e7da5ad6d0bb7a484317d7e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10436 bytes
font_02_sfnt_off000101f0.bin
7616754b0265a5e457e372ed3b43ee76792b6457edecf9166a71fc9e1814ec03
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16624 bytes