Malicious PDF — malware analysis report

Static analysis result for SHA-256 2442c99ec6ddb274…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 06:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25c9e1314ff3c7bbc7bfd0f129da608b SHA-1: 40e28720688ecdb1b177114a7ca21ca38e8611d9 SHA-256: 2442c99ec6ddb27406ec5d7dd297074aae2532299facba24845440693fa013b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=master+for+minecraft+premium+apk PDF link annotation
    • http://potya.com/sovox.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109102204428769.pdfIn PDF document text
    • https://vleek.com/uploads/files/36573976923.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/furojawujedisu.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/43085190065.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348f7c2b79a---44369984104.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/2474076360.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/misetirojiginefudufujapu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/danozedalolezege.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/retuterojunazeluwozijikip.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kututopopififusi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9880e2eaf---88592717727.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161426d32a9e16---gewatavimegixosonamawi.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/koluvobanijas.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/wafuxosisotidonalavu.pdfIn PDF document text
    • http://infunplastic.com/d/files/zulupedarukusalobuk.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/samokalefem.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/36731617076.pdfIn PDF document text
    • http://elitacasa.it/images/file/55331029131.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/8483453320.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pipoga.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902082304.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3407237127d04b62e78c2be81c611a5a/xefofunerukavovixod.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/lipete.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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16652 bytes
SHA-256: 0a6aa4109949b261f0b0f74fc2cf90f539eaddd1bfa87404a5ba28164da4628e
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 10780 bytes
SHA-256: 27d46e9bac16102bbb6d41b589969f9dccf664774d2c4f2635041dc6eb16e4c6

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