Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4515af85e08bd18…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f1ee0f807ed17ec4c33d2b31fe6676b5 SHA-1: a686bf9e1409f4d20c71fda8af61fe183db9751d SHA-256: c4515af85e08bd18205047303e975efbaf61b876a99fb5b28a921be268fa70ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple distinct URLs and the 'link farm' heuristic suggest a coordinated effort to redirect users through potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/260cb2c210fcefbebb25ba941305049b/jobemula.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856b4758c54---12115866713.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160812ee850892---wibusugoxiza.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/53642191268.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc31a2db---97910311572.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/muxijefo.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/8044526e21fe4cf1afcd5dcf95885aec/23281033748.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/23aac8e8e218b15193439a9aa5d58279/27125419171.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/fedanuxo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e2ea9d91ba3c2827adf9b59f92a7231d/36880185672.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4245c7f45f---kudimirime.pdfIn PDF document text
    • http://cichanski.com/Upload/file/78772084410.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/du9kp48fgkjrf7jag8gjesb6o1/kilufusegefesupuw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf62be30f---nesebetejijaxijoguxofivap.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210709063605896344wdutnzz6antp.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c4da3d4cf3a7a6d01f47c2b84113d2d4/pomenolobemokor.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/mirunuwejagus.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3plaaq5ds81oq0ndlad8oq8ajn/42199662985.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/jizosuzexek.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/77796013839.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/628352a2801c1b275e04a5a5dd706050/bedawozupok.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/delarewes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=most+expensive+cs+knifePDF 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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 17980 bytes
SHA-256: c98bf33806803a5c6dc6e7a8414bfef97fa3f3b92f46512d560cdac15d81d48c
font_01_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 10416 bytes
SHA-256: 6f9eb148601d4c9124a7822d552243a927d761366f365f2298a8df17c62a32b7
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.