Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffc9264b1adfedd…

MALICIOUS

PDF

80.7 KB Created: 2021-08-27 16:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d40e0514358728580a388e4e0d4f86a1 SHA-1: 50dbb538ff53342771fe9e9ae6d17b5036767d60 SHA-256: cffc9264b1adfeddd14368cc3df6a906b839c0eab93ab336095b0fd28f069c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of these links and the overall structure indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archifolder.com/userfiles/files/winowiwakaf.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/85ad29de0799143c7e2e91a1b5e98cbb/kuzifu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6f58c94---13667956937.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/vebufosudevalaf.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/3177373253.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/27d755954773f937dd8e7d2951229f13/rekawukigese.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nuzijetiganovukosudil.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/70349844027.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lafasusa.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/47062461341.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/90996920016.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48474791d---14278828672.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb42946a1---23877017612.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/pajarow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80f7e002c---tudugifijupokivojim.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/33006380571.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/6263991458.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9adbae5941561a90baa3e8dacbc758d9/39901142149.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a306ebdab44---noderipimagutegigijibu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vibojojoxasipugum.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa904d87f---betopolexiveranujija.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16212393255833.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1bd33744---16250583958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lower+back+ache+and+crampsPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 15876 bytes
SHA-256: 4130b89f0468fc8740aedc3c093940b1b73fe9553ecdaa94de0e4b77a699f746
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 10816 bytes
SHA-256: 13ad237b8d9c175e0575f92035d02ca268478cec06cb3921ab866a6b15416b6b
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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