Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4000770179e1c2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 11:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac4d7b38cbc54b1ac2342e7da2f785c9 SHA-1: 2cd793c3fb197dcca6ad6aa9caff61c4fed5104b SHA-256: cf4000770179e1c2001c7db968078e59149fd8328f5bb72d85c4aefb0c4982a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=nfs+most+wanted+for+android+free+download PDF link annotation
    • http://wamer.org/userfiles/file/65069530446.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/82210574875.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/ketaxafopo.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dazizoj.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/30321593458.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/fenigaweponibofetuj.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5b1b245c---rumunesexafo.pdfIn PDF document text
    • https://quizai.com/uploads/files/61256992476.pdfIn PDF document text
    • http://hanleyresources.com/images/62083258584.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/50213716987.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/95254986484.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109021311463466.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce7c3d73f---segaxanesutiwe.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/jipumovevanuxalopes.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/436e7c76e860d2c315c051a8ac3b7c19/79748951298.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae427f25b---leriloxinagulibi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/83266096394.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7vaqfv34tc9d1anmiu84l207dj/durilowibokibivosikewe.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/wagutixifopiliwabutar.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/sofuvi.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/lulikesomefepuvumow.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/kawetaxafeto.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/137d9ba2c2b54f7db26209308b38e454/mojonanigivipiwup.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/16088097423.pdfIn PDF document text
    • http://thaide.org/userfiles/file/rodabakaxudopabipesadu.pdfIn PDF document text
    • 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 14332 bytes
SHA-256: 5df14fde07a566ad4b86190d73f1488cc6f09e31d2d4b3a14e6e9eefad0a938d
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 10580 bytes
SHA-256: 9e5a3eb1a4ebd8e3b3e75fa51d635a7de1384e025805bf646995a291d9e8e81d
font_02_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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