Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0065fa7396692f…

MALICIOUS

PDF

140.2 KB Created: 2021-09-01 08:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 799ba72b8eb1e7d8205cbe15a565cf74 SHA-1: 5a4b22d1bd555f332ca38ef83a1b3ea6eeed099f SHA-256: ff0065fa7396692fd167573351d8be410dee1c915e1d109bca6e8e9e4da197e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/87697884655.pdf In PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8e096746575a46278d6eb5305d7af93d/robarorobamodosomer.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/31917381582.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/88336388011.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0dc14c934ee97399fdef616e8ccf8253/musozugaras.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a51c704fe0f758ed8248b0c0cf5e3e4b/vetepoxopazifibolomup.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/27598610786.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/tixopewekiwiloze.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7ff6c7d7---gologotov.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/20152301583.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/59b092496f18a62cdf49dddb6527bca7/916221975.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0794e25f---dewogasumejefibowideve.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e361913323---xevirigezemuzenanuzat.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/xuzewunetibonot.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/23751632742.pdfIn PDF document text
    • http://webursitet.org/Files/file/81480170089.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944940411bc---12026220934.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/90925894817.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/lasoxelajagugilefebo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7fa1230c508bac5e3a68faba9ec7abbb/50332972861.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3279c4cf2---85633864638.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b37867095---gukipoz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abad1fff3---50588827528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=edvard+munch+weeping+nudePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAED 20424 bytes
SHA-256: 02cccd7cedca521fb048a5da2e5deadaa2ccca228d925e42857eb22b2d754872
font_01_sfnt_off0001f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F04D 10764 bytes
SHA-256: 98e754dbcf05b5841465efcff0825a92ea44c922767119127b802c89cf54a95e
font_02_sfnt_off000208a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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