Malicious PDF — malware analysis report

Static analysis result for SHA-256 5718854c6c49799b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 03:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cca336b1828161d16e706559693f3e70 SHA-1: 25c510c445579d6be91fa79bdfed0d5db899ba9a SHA-256: 5718854c6c49799bc6ffd5e4a7e9a141485c0f9b8b8003dcf98b9057b7ac0ede
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that redirect to various external sites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=see+the+wifi+password+android PDF link annotation
    • https://agros.net/uploads/file/tetivurerevurulan.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/35684994725.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39c3f21c5---xejegawosekem.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/velavinudi.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/gojofegaporufi.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/56674289837.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/diwulaletozidojazo.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/14267693323.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/53151428974.pdfIn PDF document text
    • http://punaide.com/userfiles/files/24616760067.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341da660bb3---dudogimuverizu.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/18903790880.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/55442461465.pdfIn PDF document text
    • http://dsfly.com/uploads/files/noporukafem.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321ec9e3d86---rinev.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/35291659155.pdfIn PDF document text
    • http://robedecreateur.com/img/files/fagidekawuwat.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/jiremu.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/9659954915.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/zigikupidatomusen.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jevasudasegukuxewaw.pdfIn PDF document text
    • https://nexusmediation.nl/files/94887918214.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/pujirawogufofavekawuzewi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sexujune.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/vebemijupedenejepinirorof.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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10712 bytes
SHA-256: 98d58bdd6f7e5f167a1ff87822c1e9677333a53c81862dd204c2aca1588623fa
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 17776 bytes
SHA-256: 84613bc074b5ee0851d671b2c2d1c4c49154cf597da1b177d7591f168b7f7311
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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