Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c44e9d252249be5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 21:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e38bce7cb549463bb39d542c995113f4 SHA-1: ded9c9f2bb2c2d0ac0151e4510f1f0244b544394 SHA-256: 6c44e9d252249be52b00c29d4e6cbffc485fdfaf224541344f0b39c6d851bb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the high confidence verdict suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.agencesramos.com/ckfinder/userfiles/files/5791328141.pdf In PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fulufegizatamagosexox.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/zotetovobatoxen.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/girukiw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613762dd59b08---5372462341.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7272962ba---28362815027.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090522542935.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/bigumagodimukuxa.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/19158880987.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xonenat.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c43f7fe66---dutisos.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140628e4550d---96604477624.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_3D368C79CCA92829.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/1872128225.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xukufijuniwalejibekit.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rumimewotuzinixoramu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fe47d7830c16ffe1dc71e191200110c7/27172964743.pdfIn PDF document text
    • https://onlinendttraining.com/files/mamezemavu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7369d712447d6a56317e86c88f2c938d/59504975685.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/zesoxenawotunipitupugage.pdfIn PDF document text
    • https://o-dance.com/upload/files/tawipetipeniritegelajaw.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/63708393537.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/34843875561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+start+phone+on+safe+modePDF 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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10704 bytes
SHA-256: 4d2067a65b7663c285f06763fb86be5aaccc63147080ca8eb11629ebb964035e
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 17476 bytes
SHA-256: 7b6d81673041e74e974daa4cbba53be26542bfefbce587d67404d95549dfc141
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1