Malicious PDF — malware analysis report

Static analysis result for SHA-256 7916831a96d7e89b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 11:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9cb2d54d73bab514c62cbc9898c78084 SHA-1: c37efdc4bc370ef3bbb3ea001c82e7761034e564 SHA-256: 7916831a96d7e89ba13e470bc74510af5a185811415cb07b03546bdf21ded83a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fleseriuassociates.ro/files/file/fasupunabexelenigovidiwo.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/44487391525.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/tumibegevilef.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9c7e01e8e5cd43d3856387bf751b4b18/naxomefafupakirufesosuzim.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/32112098525.pdfIn PDF document text
    • http://www.77ice.com/upload/files/temadajukaxafirofiborujud.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fo1jr0uha5smu3urfju8v3p6d7/19559456996.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/segewusanobidifunimi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/xifoxukuvona.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/kanos.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/terisivepa.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/xisasitabejovaseba.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/zopemop.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/58050454146.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/dexixinegerojifarewuna.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0b612079e---44570039638.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a85c8344a---rigetowepi.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/16154704245.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/jubedujerijevapejer.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b5aa7c0---ruzalavubiritosuz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77134a80b---29408365417.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/tevukimoravuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=subject+verb+agreement+prepositional+phrasesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 11332 bytes
SHA-256: e7d9bc111cc6d8718d8f77b4493e950a92856ead80ef6acbffb3f9a2406bfcd6
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 18248 bytes
SHA-256: a4b17d61d0879f62bfe006d2e6fe60c1f4731c71ea96e9e2b812993158d7333d
font_02_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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