Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98e45f9b4a99df8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 06:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67541d98131da5f0094ec6d8e96c6e0d SHA-1: c4231f857b13b732d1df4277bd95908c1fe39e94 SHA-256: e98e45f9b4a99df8b4cdb8084e4bb02b944491157986d65227c971ff97fcef04
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the links indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148674ef026f---navanu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433d25436e9---91317618696.pdf
    • http://gibisch.info/files/files/9855710979.pdf
    • https://rajaunited.com/contents/files/ganovonudigefap.pdf
    • http://guowangcable.com/d/files/28298970093.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/85518270960.pdf
    • https://manorhair.com/uploads/files/202109011816396732.pdf
    • http://jeyadhurgatemple.com/userfiles/file/20951886219.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pi4v5bfcl1algc2o0e3k25d6p3/luvopowu.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_F95422341A1A50AD.pdf
    • http://royalwedding.jp/images/blog/file/tanurural.pdf
    • https://cjsc.se/ckfinder/userfiles/files/gunogawowukakikofujoret.pdf
    • http://rem-proekt.com/f/file/75365976144.pdf
    • https://questyme.com/userfiles/file/55974323651.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb5fce498---dawitofedusepob.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/sijelikugi.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sojetowubipogafaxapiwored.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/xotiwunosezinaru.pdf
    • https://reha.bg/content/upload/file/61107182866.pdf
    • http://metapolar.hu/tmp/riwadunixetijinapa.pdf
    • https://kudamatsu.org/userfiles/file/mizupimobovizanuvamowow.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/76313045688.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/30795917037.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=open+pdf+in+my+phone
    • 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_off0000b7e8.bin
9dbed6c4429bf8053c24b1ad31e6be06e5b16288058c82d01b2506d4c7864f37
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 15432 bytes
font_01_sfnt_off0000def8.bin
4a571c7f83505788a3c3b6648fc9bc86ec495605c39fe51080fe3f3309e0c859
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 10328 bytes
font_02_sfnt_off0000f60e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 16792 bytes