Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac36bf4d51ba651…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2fc483f5e503c8ead4567afd3c61d98 SHA-1: ad179c1d779b3aab67d8ad6efccb51edde90e156 SHA-256: dac36bf4d51ba65162f366ec39fdbea0fd68887a62090811206c64e510363fc9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=pet+cambridge+student%27s+book+pdf PDF link annotation
    • http://francescofesta.it/userfiles/files/54414970892.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/lozejedikabogufu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c98ff1a83---veramewutef.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd104950cbe---gisufetuxolawag.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f003ed66280---24379268667.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/14140b4f1e10cdfc307e74112489551a/pinujadet.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/22804890764.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/21631165877.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rumotozemibofijonufi.pdfIn PDF document text
    • http://rapet.hu/files/potobegad.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06da2c04---lezemutazoludegewa.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160768b25617ee---sodejagubifuvowod.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806a09b8e67---64914289329.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8edf43be2---dikowininemubetipusego.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/72761490321.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/97162359526.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421113ed7e---pakajumuwasorulel.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69fe03e32f---josimuguvekibur.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/kasanefokojono.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d57951f8e---fileworejopenixujojowokuv.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607573fc58cf7---wopixezimo.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dupofimatege.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/985454059e126934a0bd4fa2a3141d69/10043777329.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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 17612 bytes
SHA-256: 12874dabc68aacb9e6c556c8370a937b5924a8c521d379777d0f427221f08f59
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 11284 bytes
SHA-256: 34a14f90d07b0d07af23508077676cc2772a3cd15ac2ea5f5dec8b119faf62cc

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