Malicious PDF — malware analysis report

Static analysis result for SHA-256 63762f908ba4da41…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 03:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69cf473073fa55d65872fcc78fa388b6 SHA-1: fdeaa6130e226a2fb4b00df7e35d5aeb95f4e8c4 SHA-256: 63762f908ba4da412c3550fd68e2456f61b4254a29bfa5a248336d46d97e3076
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cbbd1ab89d869e5d5ceca9a722e553b/27567169240.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/81875740473.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jelof.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/zipivivexijeponi.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/91279975555.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612077110189f---wamube.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/7273669428.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/33406583622.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nivenizebebeg.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9a1bd464---51140255633.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3843cba1a40c343aba59ee2072f30bbc/89943262232.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d77c22602fcb1113fb129afe1ccc44e1/laxobasaguwanunigib.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fa58f19c6b7---pimavaxogeviguwiw.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/povokebepubitunizaxepulo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da151304---putizujukewejaluxose.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7840ce9121---47214862956.pdfIn PDF document text
    • http://geotersrl.it/file/vibugapozivojizero.pdfIn PDF document text
    • http://artside.org/data/temp/file/xixepolikisa.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/wunutiwaxu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v9kgi0da2nonaq2dunt6u5ruk0/kuruwagosira.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608077401729a---97065944980.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a78a367---23880575361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=7th+class+science+book+chapter+1+question+answerPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 15228 bytes
SHA-256: d5619b9e8c44bd369e1c954bc7c3293a75ca6e25cac056ff4c2e64f23645d968
font_02_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 11040 bytes
SHA-256: 9cfb21dfa1a0c37c85380266015a9d7f6e5b9b890a12529dffe7bd712274e033

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