Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ddec68e3728b74…

MALICIOUS

PDF

83.2 KB Created: 2021-07-03 00:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 881e8f94a826c1889eaad7df0e0c0f0b SHA-1: dfc14a26995ae57b6904fb38d031a6590b5a5ea4 SHA-256: f1ddec68e3728b74bf40224e1a2d12a729677ea392d27ff26ce3f6a90f59fdcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, likely for SEO manipulation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c74b231e---11814078018.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608149f84fed2---1741288515.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/76c3e4e09828442a010b39d0ad4d34d6/telelojok.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/furgeiauhnnmg5j2brafftdfcd/43334758666.pdf
    • https://steklo-shik.ru/userfiles/file/69931857217.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r6pt6trgkja41cu2lk5lu8b696/sutoxezogo.pdf
    • http://dambi.pl/userfiles/file/puwupakipijezegaxewixu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978f34f39bc---14787181348.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ea629cd8dee74a55500f685bfe55b296/11058373686.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/41a6eb81be2955b9bed84ef1f4d1b34f/zedufilojur.pdf
    • http://fine-cottage.ru/userfiles/files/sagak.pdf
    • http://travelshops.pl/userfiles/file/xazebezuxidupuxoxegibu.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b10d638afc---vidutesezabixuvafemaw.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2f560964c---verasobu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ec7aec7a---73902083007.pdf
    • https://alarrabnews.com/images/content/content/file/figoxozijafeveworuli.pdf
    • https://arrayamed.com/userfiles/file/33466683115.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/53360281077.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd913da4bd---rixevemuderevubutuwina.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f778a8bf8c6f77a952778b06c3ee23c6/juzefumujeloxasadijurin.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c78b94654---livijuxekafegijusebuve.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=indigestion+and+back+pain+between+shoulder+blades
    • 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_off0000e3b4.bin
813002cb99a90786c48237fd4485591a3f6811045866978b97bd7d89745d8631
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 16404 bytes
font_01_sfnt_off00010d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
font_02_sfnt_off00012598.bin
3ecc7bfc21e1677656374fbbee5d12076d316b306e85620b97f73e894b6e5224
pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 11160 bytes