Malicious PDF — malware analysis report

Static analysis result for SHA-256 f830540fe32c54bb…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 02:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87790e0940994435e991736d5fe0ff07 SHA-1: 932b94930c04f24dbe10addc9f662712d57421e9 SHA-256: f830540fe32c54bb45832e3d558f36562c8a1244805bccb5b9953f44c07af013
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/42p55u7qu322qi1jflnv2lu8fk/vijugekako.pdf
    • http://esoftland.com/userfiles/file/virik.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4373ce7e9d631ece49a752c1de800a96/90112412421.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b19dd627f3e---45816415976.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cf2726f38a644c7fe403fc2b1dfd30da/karuzeburinamelekebumukun.pdf
    • http://yuha.be/_files/file/33750854883.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8f9e64e1---xuwiruw.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e7ca90a2549124e4aec8ac9652a38ba6/73132108651.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fm4j1unngg2jb7f6ols3pl9b7b/gopivixumar.pdf
    • http://simonide.org/userfiles/file/fibed.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c85443ac9cc---wefanivaravorumijotib.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/t3tq0lbqs0nki4483ll2r7f72m/papalatokanexikumiw.pdf
    • http://wienbildarchiv.com/upload_files/files/jamisojakadi.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h90ob9u3a9d729cgq8e7s1430g/zukapivezide.pdf
    • https://mimpishio2bet.net/contents//files/jukowawejodujaboxeb.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62d448efd---juvinolipepi.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e287a7800---22629121063.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/klkmsldvl202vm3pe2g6cjm632/17653106889.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960610ed83---jadax.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c09bc2aef---56491851873.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a663e6b9---bexuxunalazewiv.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/komirik.pdf
    • http://proxima-design.cz/files/file/togesunizubaxofurunari.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad12234e5---42304773283.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160996cc848cc2---paxasilidolerebumun.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d9d58321---navazeritotetowabufuwu.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717151d136c---94683420668.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8fecd186c4f079ed392db565898eeeff/80735875788.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+roblox+gift+codes
    • 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_off0000e6cd.bin
ec828bcca000d48c49e1985d1b192c9156c7e7ec9b0ec2ea23f4c386d10af076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 17272 bytes
font_01_sfnt_off0001140a.bin
f440aa133c8a56fd175eb42a4b82d64e018c8dfc6938220220ad418c53bd1c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 10604 bytes
font_02_sfnt_off00012c29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 16792 bytes

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