Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ce9829e2b6d87e…

MALICIOUS

PDF

115.2 KB Created: 2021-06-30 20:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: debb0aae9287c870ceabc534c7ed8d85 SHA-1: 169b20e7762cc479e652f1662c3809bd4fe11642 SHA-256: 53ce9829e2b6d87e78eb6f18e738dc36c5914d42485e1f2fc4d22ca1cd526ba8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://uniquecharacters.com/upload/files/61698976635.pdf
    • http://dotacjedlaoze.pl/userfiles/file/lulidozagejeg.pdf
    • http://infinivideo.hu/sites/infinivideo/files/18552857186.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8755ab40---83738487671.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/tidedujoribisujek.pdf
    • http://bielwod.com/userfiles/file/56120275396.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160895516e75fb---16535913412.pdf
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/70187319108.pdf
    • https://chmelo.hu/sites/default/files/file/tifanetepusa.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3fdf36064d22e12400aa684ae82f6cc5/bezit.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070418ad9862---winize.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qpaki3dgcbu1m6u6lnop9v9m2q/33714132376.pdf
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/65653769518.pdf
    • http://thaide.org/userfiles/file/29082650281.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/35105263200.pdf
    • http://primaneighbors.com/userimages/622668767.pdf
    • http://aven.su/userfiles/file/53798897465.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912888b110b---varulazupegutonoxexe.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1aa6b75e---42759177849.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c54c738kj0ok22gbc9mpdj72jr/jukevanurotonogigewumure.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8pd8vqogao9q9kfc5p0p2s8of4/bawimibuvonom.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dcecf235c---8400996896.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b1d995c0---xikereposewijipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=8+seconds+bull+riding
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161B1 16792 bytes
font_01_sfnt_off000179c8.bin
ba3078d14ea80d48bf2f118e70089aded4e2cd7dd0286ca8185adca9e91a89ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x179C8 10636 bytes
font_02_sfnt_off000191f3.bin
b435b33e55d283841a32f34c7d4be154d492788e8f1b3c46435d14b3b64b4893
pdf-font-stream PDF embedded font (sfnt) at offset 0x191F3 17732 bytes