Malicious PDF — malware analysis report

Static analysis result for SHA-256 297b84d0254d7c23…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 07:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 887be49945b8e1f0381277f9adfe9cd1 SHA-1: 9f3e06be5ff8163d1a008a4e96dffc64303a1508 SHA-256: 297b84d0254d7c23aeccecea6cb536da58488ae08d928927bffdaa82b1ba9ee3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

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 https://garglob.ru/uplcv?utm_term=styrene+butadiene+rubber+manufacturing+process+pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/73c2f0e0184e91c40326b3ca212fb7c1/kifulaxuvidewubidajexozu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/34r5rmoggh8ti41iq370avr1s2/lavunowetorasosowevuxux.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cebd7380---73067340317.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/21c1f56ef1f48a3cea6313fbcfeb9799/67811800201.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/43664954643.pdf
    • http://foodchemsino.com/d/files/98306088653.pdf
    • http://amctop.com/board_data/editor_img/file/202105130832.pdf
    • http://restravel.ru/ckfinder/userfiles/files/wefigir.pdf
    • http://huichem.com/ckfinder/userfiles/files/dizimuvutakajulebojetapat.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1521052eef86c04f7de249b415afb672/xopatebenasujijale.pdf
    • http://topoint.cc/userfiles/fckFile/20210725015546.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/rd3kea5ga5a3joec3ja7rmbuq6/gijej.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff5495ce14---24059848005.pdf
    • http://malagi.pl/user-files/fck/file/genafizarogavoferix.pdf
    • https://purefeeling8.com/data/file/39685507488.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075986a7895d---fokedebov.pdf
    • https://artistaone.co/userfiles/files/93015608830.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xoxapon.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85de10bc9---gemalizefegola.pdf
    • https://marblobath.com/app/webroot/img/files/22881894773.pdf
    • https://krono-original.vn/Images_upload/files/kumogulizajuxepo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b070a02e13---20897431077.pdf
    • https://aksusu.com/upload/files/puwadafa.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cfe7d8831239f8a4462436d27c45fa4a/76346383760.pdf
    • 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_off0000d4ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
font_01_sfnt_off0000ecc5.bin
8e6553c0baa09b17b5f23f33b3956c906c0c255bf412543de5f42563a775cb69
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 11348 bytes
font_02_sfnt_off00010714.bin
ef06433764db48acaa8afcf8d031a6b31ba81972d3b7786de3d7487ae0815553
pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 17772 bytes