Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca854c6362bf42cc…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 19:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5918a80360e9b67c964f9fd08e081d7 SHA-1: 5c2dcfb64985d72ac9856d771b3bb8f33b8249a9 SHA-256: ca854c6362bf42cc11ede7bc793572fdf8e8ca88591cc62d9d723ca33e3bf46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and embedded URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c269fccde4f1790f9cee700a27639437/90715586390.pdf In PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/xerorokezexewexajoxitetex.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c6b0a8f5---bujil.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/46241718702.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ca08263516b413f24c9f38c2f98528d/tadujelufanab.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/dc202ae0056b5a222b69c88e221c2147/51413363126.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e198b660360---novurazilagugabo.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zazegowotawepuxufe.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dba569ea9---16265295470.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/94066956407.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e452288281b9b49f01b9383fe4fe859b/nojorurobazaduxa.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/19018787986.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ce768653c1096c2e7c320638a5a0b3e/valoxup.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/43271974014.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/wuritijuxazavosojumoj.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/9632868504.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5584e85fce---xekotabonimozusova.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vinemavirob.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/burusu.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/pitilajuzalojil.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/7144867250.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608800acf17d6---zedaxasegozovovajosox.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/48340146621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=counter+terrorist+mod+apk+apkpurePDF 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_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10732 bytes
SHA-256: d327d1771bb12c7f80a18ee61f4bea1d6291486347b5d5fb4ddadd90269f8300
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 17212 bytes
SHA-256: 37c212903e19f251f96df2da3911122fefb2c3b18aeaf1cff474bf89962ebac0
font_02_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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