Malicious PDF — malware analysis report

Static analysis result for SHA-256 4485c4a270ff9084…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 12:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8854c00f95eca86fb09791c3e249e9c7 SHA-1: 7ce5774a1192a190060abcd788a81e3441401290 SHA-256: 4485c4a270ff908451dd4b4de8d435a051028a3310b58367e4067b8e006e280a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2vdr80fvgfi9gtp6pevg8jshdp/35233561015.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848be233445---depiramapipaludexexerav.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b6lsvgamjshu12j9sp04va7ki1/17780384978.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942206a4a75---11121413051.pdf
    • https://rent-1.es/ckfinder/userfiles/files/vapanobitig.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95779e548---38488537382.pdf
    • http://agendatourvietnam.com/hinhanh/file/midewurunirixu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42528c2615---nusorejeze.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7e4281fc---kirotisebilan.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720af29ffca---bawesonuse.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/25a4de89c91f91d46e392583696854a2/16364963088.pdf
    • https://saam.vn/images/content/file/77107096252.pdf
    • http://brooklynsmokeshops.com/admin/images/file/kukopibako.pdf
    • https://sinarwaja.com/account/files/24606421394.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a2ub40t7udk72jm5or2352krqn/badadizupivoritukuxinobi.pdf
    • https://vildmarksjagt.dk/userfiles/file/65305056046.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8e671f4d4d57286fc5e3d1c9d01fe2fe/13502434350.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736dd1d1ef1---7446950173.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083030a28135---42103248327.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/19694fcf3a0e6b714e85536ae909aafd/xonowogemibami.pdf
    • http://abpaluso.com/upload/file/80482697505.pdf
    • http://aylincinarli.com/fckfiles/file/kinad.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b943171527f---nekinedasafobodigufowa.pdf
    • http://accessiblevehicleservices.com/userfiles/file/17298240942.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mcq+questions+for+class+4+maths+pdf
    • 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_off0000e43a.bin
e970d9d409d53752cae63a909121a826f179a91a6a799c9cbcec864a4d7ee352
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 11200 bytes
font_01_sfnt_off0000fe19.bin
6477cb90894cfc7b8751e3cc4678467c6d1a551044cd44e95aa70912de81baa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 17100 bytes
font_02_sfnt_off00012ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes