Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6c316fbdb07509…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 06:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa7ad6cafb1db64ba73edc60abafb346 SHA-1: 4ac047c88a1084284866dd49906f717000c20415 SHA-256: 4b6c316fbdb075094ed8a26aabdfe67a035acfd0e0bfcb4a278c68f6b83a3101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://inwebjor.ru/uplcv?utm_term=max+et+les+maximonstres+maurice+sendak+pdf PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbf6f1e3d---92385912960.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/8066494311.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/72313097586.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/10080282407.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/zusokorogowas.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/pibofemikuja.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1448931d41---21977099898.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/2724594100.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/71704674590.pdfIn PDF document text
    • http://secretinvitation.net/images/files/rewijixasubojudilegi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608244d4c07f8---widapu.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/foxagavosuwevijewuxelelik.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5923a16c27---luwakedu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/74687854953.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/62069211991.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/23859870968.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/535d52e20c0f383bb9b2a9775696d4e4/mefudisesuvijixojojo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh0gmikoeqltaq5cdbi4un6n4/45323359182.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/sivipaluwexawazifinoraxir.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/51036396983.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd145a2042---32320798947.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/xojigeganubefadepudiluwur.pdfIn PDF document text
    • 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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11068 bytes
SHA-256: 5e21f409923c25f28e869b401feb04ceff56ee74b0b987ad349f1b1e8fee367f
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 20476 bytes
SHA-256: 35934c66226a32c3d3efbc8b3429c4616e67dd6ef4036003600dd078285a3f9a

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