Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efea10346594781…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 22:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88a763ca2f8b1a81139e7827a23e5539 SHA-1: 9ee1df1b72935bb2fd38535f3a899fdbe227e8bf SHA-256: 6efea103465947811aee1319bfbf45f6ba32c7c208ff59cd077f6b6a59bb8d00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f7dede76---timelu.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da13e9537---64863522206.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/3562875921.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/nakerodanoxafukexibufone.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/sopimobizatusakerit.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/462f6c09dbec8435669b427c9ef0cff9/vufixuzimaruzulilalo.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/83122240890.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/39168920404.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f19eeb44cbc94f387211088b0b89e421/lajelafakuxenawe.pdfIn PDF document text
    • https://uaatc.com/userfiles/file/losukev.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nf6bekscbmg4ss7nccaen2hnn1/vuwanezovesevaxazewes.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ea08689a291cf5541eb45fcfc8168fe/26447470212.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/31686162462.pdfIn PDF document text
    • https://tavio.ru/files/file/1144017236.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/54686397122.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6eaaf2f---wusup.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rikinipetefivupezesoluk.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/tugetagerirubosogu.pdfIn PDF document text
    • https://carlojans.com/cms/file/boxipazajagasagebe.pdfIn PDF document text
    • https://strechybenesov.cz/content/54582497727.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/23147951949.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/dowulinala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vedanta+limited+annual+report+2017-18+pdfPDF 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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 17916 bytes
SHA-256: 3990fd368c928bedee2056b54f76c5d98c0340eda8826a496cf5123b369a1069
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 11148 bytes
SHA-256: 29b32eb3f879707cadc2629554c012766cdd6ea61995569af7de93c863272fc6

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