Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd44e7f3a0ffd358…

MALICIOUS

PDF

76.1 KB Created: 2021-06-19 01:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4269dd5c48363df022462c4430793c41 SHA-1: 6f833f17642d805c5e621fbbc7d708263f5c284d SHA-256: fd44e7f3a0ffd35886604b120e34941d9868c7eba1658d3026f319d3ae77ca1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection attempt. While no scripts were extracted, the structure and URL patterns are indicative of malicious intent, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2727b97a---badoxizawepojisepujox.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524652fc26---92334537096.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a374597f817---jupujokoremizowemasi.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbd08c279---55067396743.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856176e861---boligosirixu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c4db019e---tiguma.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b267550d4---mebafubuvujafapawoji.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4609276511dca80998feee55552e28fd/16265760647.pdf
    • http://hacoauto.vn/upload/files/zatojutus.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7a176fa48aa00b3be66773259058d03/mebidiwudamipogiba.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094846642ad6---pobepuguwevesedopudon.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941a49d47d2---zexilosu.pdf
    • http://hnysft.com/d/files/47235989028.pdf
    • http://armanetti.com/images/kikikutitomidenoxifuvevaj.pdf
    • https://cometsecurity.in/admin/userfiles/file/kixufamogoxaxataseviweki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=battery+life+benchmark+laptop
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb22.bin
603dcf12b0a086d926747360306b77b11c6076ea5901443ae0b55112cbd9c5fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5432 bytes
font_01_sfnt_off0000fd7a.bin
c9332214731153c844012db6b0ce8dc73e6520ff39ff86891062b060f025229f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10792 bytes

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