Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c18a8a5dee08bbe…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 08:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b59559e982aae4d1a9099bdaa9ca33fe SHA-1: ee2690b9a484045f4b7c19d9c34bd7350cf0f79c SHA-256: 6c18a8a5dee08bbe3cb658e847df64abf7ec0f5cfe9502c7fdc2cdca06b03cef
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of 'cmddnuaag0frr8tn8ar4tdm3/tinureti.pdf' within the document text suggests an attempt to disguise or embed command-line related artifacts, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/kmcmddnuaag0frr8tn8ar4tdm3/tinureti.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a563bcffc---pabufopasad.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/94442975559.pdfIn macro / runtime command snippet
    • https://villamishkan.com/310renonew/front/images/files/60601239205.pdfIn PDF document text
    • http://zaiger.ru/img/file/1123842305.pdfIn PDF document text
    • http://bwc.lt/i/nogivovojisutodat.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/80338a68102f12c497ddef4f915e0b56/90160699269.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d8636e28d272799362606de933125af1/52888133797.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ca2611cc6---kiwumabagexurise.pdfIn PDF document text
    • https://electroagro.es/pub/files/4692946440.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efe0873a7---8754550876.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0199ce8e0---xulutabefiluvofoferifowa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666245b826---vagawakoma.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fd88d3299bec2d95956c08e5bcf04779/39407628735.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/98243930820.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/farasexinowevuvasazowe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b97495f4d---25185890462.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/de39484edb22a46b7279be0a6d7ccc26/paxapero.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf894bdff1d---76582779863.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/78408604703.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/vanoneduribebilakolinu.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/bizirosokigatebodokuximo.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gabawojugabigimo.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/52774353601.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lebuwope.pdfIn PDF document text
    • https://g3az.com/wp-coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=six+sigma+quality+tools+pdfPDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 11044 bytes
SHA-256: e8897b66f6b616752495864073530724136ed44d40da239d431435544de8d317
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 17536 bytes
SHA-256: aad59c439c3e3b58c0df3bc8538272eba9fe55eb617e92f25a39666dd420b2c6

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