Malicious PDF — malware analysis report

Static analysis result for SHA-256 e330384f34967c3a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 20:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 444be87e1016412a25da3ad478082d59 SHA-1: aed8cc9011b18f1efc03690b5c4497dc4dbe566c SHA-256: e330384f34967c3aa8b96d61c4f89490c357a627b6e5ca96166b037d9a418a9e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2e1b6834---bugeziwefikax.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f104db56155ab70803b6c385a335d550/38653064289.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k0v56htdc33njsafk42t8g5mr6/pabukodatasamexegu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0e3efa251df67389a83b609b7e8721d5/91164068893.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ca900ccee56f0ea95a396798b633af3a/nedovulajenodu.pdfIn PDF document text
    • http://vo23.ru/upload/file/17750668160.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/87103351390.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/dd014def6f0ce7a90d5f38a44a2a6b35/nonobe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb398d85a---dijevojuki.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/37657350942.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/50777879899.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/85268064876.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/50146743556.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092259e251ad---napajujifoxilizibefawuf.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/02ead1b2698dcc9a9624befbb43f3e08/sesutuvizugofadekege.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289b260c7d---92801061930.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/69971196219.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcadf41b7---devosemoxiba.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/89092913195.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada88d9b18b---30214422807.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d06dd6f743e6ec15de2e77b4359f58f1/56184348919.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1ab02b41---30542050674.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kisaliditopinilop.pdfIn PDF document text
    • https://hirurgija.me/files/lagezunurogoguvujagivawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=final+accounts+mcq+with+answersPDF 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_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 17016 bytes
SHA-256: fa7e8be4916b796abfc069079a20a45bc38100b43e0e33bc34a24eb2e9d9f82f
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10804 bytes
SHA-256: 832f3440d5a25e0a9b2fed66362284e9935b54e56b15f478c7a4827e65a096bb

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