Malicious PDF — malware analysis report

Static analysis result for SHA-256 9409c3f9e3edb187…

MALICIOUS

PDF

80.1 KB Created: 2021-08-24 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e0fded878acf443ea516b503b2f3b97 SHA-1: b00740ead0f73dc20293dfa07f9c11a30fdf8fe1 SHA-256: 9409c3f9e3edb187d811d3f55bc29158add0a453d3efbb70f8a0ace19f2ddb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://chcial.ru/uplcv?utm_term=the+hobbit+the+battle+of+the+five+armies+torrent PDF link annotation
    • http://pataibicaj.hu/userfiles/file/mesowimoniruzarugosolu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078351b50766---11076425095.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/58003642096.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/75351154733.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4120233858---jikinasorinajuva.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/83115050686.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/32662638590.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/rejelabera.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070365cc10ba---bofibovo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a758c1ce96e---50912719995.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/jizatiwotevowevusutidod.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a04bc0db4---55058454310.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2dcd4225---68859469735.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/67262882812.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/25571812016.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e540ab549---dofarudowakudidupopemiliw.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/paronusumakifixogumu.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/72500666768.pdfIn PDF document text
    • http://safarang.com/basefile/files/wakerono.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/palefoxojax.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffa9acff5---77262204946.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/32352641077.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/731892013579467807fcf660c683079f/41539133225.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wizej.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/tuzewefimexuredatug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDC 16600 bytes
SHA-256: 24ce831c17747b9331d39cdbc53675473d39c7c3ff4ecf75deeee7c17768e98a
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 10648 bytes
SHA-256: d8ffb8694033987c2d9871cb816ae1865ce6cfcad8551026e7d461f0bcb3c449
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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