Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9990dbfa4ed46ae…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5db1c65067af589b8fac27a5ee517308 SHA-1: b677d1a7a2bf40213e264f437eecf3318ed8f599 SHA-256: e9990dbfa4ed46aeeacbd3728788a9113531d85b9e77bbb1039ba19d1b30b282
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for phishing and malware distribution. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests this intent. While no scripts were directly extracted, the 'SE_LOLBIN_RUN_COMMAND' heuristic indicates potential execution of commands, possibly via embedded JavaScript, to facilitate the download and execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://sgicorp.com/userfiles/files/fujorulus.pdf In PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/gowefum.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/60025661266.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/ludizaranaxawikusibijud.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d46e36dd99d509f91d1f47c42ca9e3fd/59088218741.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dd40fa506b---zegojepivotenugofili.pdfIn PDF document text
    • https://ewt.cz/res/file/55960733398.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/rupojisigulininuz.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/noteropam.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/biwusisumajojumori.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/keloverawe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134a40d836eb---35327565673.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/539f3be66cb1b53b9e973aff15d967bd/famijapufobesa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc08caa4a0---lugepozubasodokawa.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/pituxupuzotulumikuzuno.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/49379156875.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/33797184386.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/tuwegogamovumap.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210904_5F0C624D42BAFBCF.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/34804281365.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/mizopadapumidori.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/88723586412.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/pumegusuwo.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_FB14182047CC48AB.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/86456659052.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136789981d4e---56059087135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pc+app+play+store+download+windows+8PDF 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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 19012 bytes
SHA-256: d28e90fe727105e2c8e7e9ae1bea112e1f589c98ab095bf9338ea4928ff75bb5
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 10916 bytes
SHA-256: 64d58a66db5885c401acc94735733b29ddadc0b1ed5d337b0caa349526b6af09
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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