Malicious PDF — malware analysis report

Static analysis result for SHA-256 c172453518118e26…

MALICIOUS

PDF

83.9 KB Created: 2021-10-08 22:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 927a31cc1f19604413949e5d86395bd6 SHA-1: 7b421976f654351be5830c41ac16b3105b471a31 SHA-256: c172453518118e2607fa22cfff56b0485d660e398e3c505996f6e667ac9fd813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=how+many+0+are+in+million PDF link annotation
    • http://xsjsbzrw.com/uploads/files/lejuboxufu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/vitulepurokibomalanuvosul.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/duforefune.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/newudojarirodovamasutumer.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/68178636859.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wamosubelawik.pdfIn PDF document text
    • https://mklaassen.nl/images/file/63646142826.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/79439141235.pdfIn PDF document text
    • http://test-immo.com/file/lunebad.pdfIn PDF document text
    • https://inarsindbari.org/uploads/lafifozabidotedexakuninot.pdfIn PDF document text
    • http://brukbet.com/user_images/file/bogideli.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/tekusogok.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/78229121967.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5c67a10c---xabekasedujogod.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615fc40348852---gizazebebuko.pdfIn PDF document text
    • http://klhl.com/userfiles/file/54088422818.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615688dba214d---tuzopedo.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/satemofikonopukisovev.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/52881121989.pdfIn PDF document text
    • https://dintek.eu/uploads/file/babutofazojefipemi.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/97155495673.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/25271729141.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/pegudodiw.pdfIn PDF document text
    • https://strechybenesov.cz/content/jetenili.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/40687715986.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/3699217651.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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 19488 bytes
SHA-256: 5d31972fc19457e8e9d7f0b03fe5ccfe23d31b0df15829e50a3165f0630a365d
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 10316 bytes
SHA-256: 447a9fe6b239d6789e9fb183413fa73f9c2c1a3a8a39910e3bcc332a8547152d

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