Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b02be29cbaf8d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 23:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d8e2ab3c2e8ce30e6b1e6629410e781 SHA-1: b913cdbd70a0ba222d8459fe7df01121e7b8f049 SHA-256: ce1b02be29cbaf8d55a49ea55df92594631c3c0bec0fa23e28b4b94718b9e2b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cfhpo0ofla8etogktp8m0oinan/52803124077.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9a220159e4aa5ad6e9c47cfabdbe4aca/fazazi.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/17993004020.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fc02da5a234246829adc5c443aa062a/78426942873.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836eeaa5c02---pukomisevibav.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/30966368428.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb17c1020---98714829892.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/wogujetewenakirusi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2cdef89e---67551001760.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/vn9v70oi5qfg28budebamff2aj/kozerobokikumonozevulag.pdf
    • https://isleo.com/i_photos/file/9456945808.pdf
    • https://bestcoloringpages.com/userfiles/file/munaxowumunufexe.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84de0e6a2---35196407273.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9ecf7ff7ad53abf65d68c619a8cb88f6/90024758301.pdf
    • http://kaies.cn/upfiles/210525011213649782exynon.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5on0ibaestr4cjl8hb61gtogub/minafaloje.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/od0ubuo24n9docclt0gs6tt499/xuwuzolavujofubized.pdf
    • http://www.abcklima.hu//data/editorfile/50533564515.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b0f90a6cd---61114685427.pdf
    • http://altelaw.com/uploads/image/file/22716304115.pdf
    • http://panziofabian.hu/fck_kepek/75935924365.pdf
    • http://ecovn.vn/uploads/news_file/7818293487.pdf
    • http://cestovni-postylka.eu/userfiles/file/mutotin.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608544d58cd66---8543380720.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=extent+meaning+telugu
    • 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_off0000f5de.bin
1028c7c1d7050d28f0354f7cda6aede22240f6c38252650b7035d97011f26ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 17080 bytes
font_01_sfnt_off000122b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 16792 bytes
font_02_sfnt_off00013ad0.bin
cda3407d79dc3afa539096f366a4f64e7c266c1d45c1ad6e218e0c5d8b7fc462
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD0 10248 bytes