Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c0f17ec3349291…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 09:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1602d75cd7d3dbca12a5cbc94ac24e9 SHA-1: 27e167ab1f094fecf7bd458f012f3e03bbdbf451 SHA-256: 91c0f17ec33492916fdf14a495fb1666527fef5aad5f09ce9ff725d534097aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'link farm' heuristic further supports the idea that the document's primary purpose is to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=tadano+faun+atf+120-5+pdf PDF link annotation
    • https://alternativecarrepair.com/userfiles/file/3374066660.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/daroragebegutunovikofe.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b91f1176293eee05d1edae44ff181592/36571431085.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kexinipifobavuwutus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492a94a6c4---wutumedopazivo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ai3o6cgncb46jnr4h6gs32vdf2/famibemesalomulifiguxupez.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/mozuji.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/tujidin.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4s2drhvb6f49g649jfv67geg05/73800572588.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a5ac14df---94556177928.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9hr3nfhvg0t41uaqpp5lr3r0h7/19981815754.pdfIn PDF document text
    • http://belloverde.net/emailer/file/44810337316.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03444a69b8---3371453288.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ec7bb2e561c503052793de4dadc83a8f/96784492662.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/diropikusazipasojapepiduj.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/243dc8c6cd6a62f34d48902d14bb5d32/zerajuwotisuxame.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/99572579981.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/bowimevar.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cb37ac867b4aec10d34dac344707e87a/80319101053.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2823d00a---ruguralunekiwaxobuw.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/rutozofezefuvawiki.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e445d74f66.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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 15288 bytes
SHA-256: d1d8d3ee8e229982018458fdafeb70790955d0e72aaf8774074343c86fb5665d
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 10480 bytes
SHA-256: 4e43b193afaffb4ecac624ae5440bb82a44409a21d27299d31f7f88807a68499

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