Malicious PDF — malware analysis report

Static analysis result for SHA-256 75365c3288c24a0a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a2b2ebf0bf1cc0b036e7750d1b622fe SHA-1: 233c80da038b3fa70724f8575693eba24f9a4afd SHA-256: 75365c3288c24a0ab1615934037661aa6ae50194aff32717e4c5c1186380c666
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=run+on+and+comma+splice+pdf PDF link annotation
    • https://giverny-bkk.com/upload/files/xevofejasusaxelevona.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f9721def---xilarukadotizofa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/89b4f3bda20d38af0f20c309ccd9db75/sukitizapex.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/mulawubefawasefubapigop.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kexuronugabemowo.pdfIn PDF document text
    • http://szm.hu/userfiles/file/mebumapisajiwerifiroz.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/74114192556.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf43a8714d7---bibaxubijizazifeved.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9cf7193851a39a49e80e54d1b9a290e8/85292841110.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tubebiparezigipovizo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e5b3fd58---julexoxaseg.pdfPDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4ce7e60---bomiwewolatoduzigo.pdfIn PDF document text
    • http://elitk.ru/_files/baxeki.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/98560f4601f154f7278dd7369135cfda/96821617014.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/xobiwe.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/71584503426.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e383bd57---12174211602.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db66e6b32fa---42278130353.pdfIn PDF document text
    • http://gibisch.org/files/files/40539757098.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/28886797407.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bcc127c7d410f092feda37565d6d217/sokarid.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f32be9d6050---nedijebom.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/63218586554.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a62d49131---fuwakar.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/rosusituselawubasotesipe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/710d97b920bcaac55ac43360f18915e5/39523246411.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10728 bytes
SHA-256: 0c4eef4fa830e6f011e0a11d57651fcd862c3b7da611f5303f5c41fcbc9f7f3f
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16560 bytes
SHA-256: 62910776f1bc4f26d3890252ef777095c75e3b067c807ec4337318a21d6a2ad9
font_02_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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