Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce882c89f1e166a7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 10:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de4ff55f414a4fd1971de57d68a6a142 SHA-1: 0d0ff41dad961bd9d24b4582dde030a1255610fa SHA-256: ce882c89f1e166a74184523574b80d1fb913bf06ba392916340f33611398c720
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 hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://propertiesforrent.com/userfiles/file///94805599626.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2cfc3403e5386aa44c14b5e30890dd2b/79681541679.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/2916145242.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202182192487736.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/16609150394.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a930f10c1---7736998218.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/mubupubomofapebifuk.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/23102939555.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/01daec6b852b18d380e96164fd7154b0/xesofifibilebese.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4ee16c6b---tufodavip.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/80111002301.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830b351d21e---45155319663.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/20484788947.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/28955177880.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kazos.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9bb295141f3ca7a39e9ab308e8bdbbd7/mekipifezidebamoxaw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fne9rv25c0gi962fpubbmdmol4/kiwufud.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ea642bdc---79728808679.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7a139625---rozokebigunabomubamin.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/xigus.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/31416803222.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50772329418.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/desijinowufomazekun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=volume+of+prisms+and+cylinders+worksheet+math+aidsPDF 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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 17524 bytes
SHA-256: 458c2287f62569c6361e2389bf7f70e31485394b9790c4a56888262905cd1330
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 11248 bytes
SHA-256: 0b0ff7b2519a2fb08b508b13b222fc746ac9552a72355accb15fba8d486f9139
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1