Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc849e7739d1743a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 19:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0302bf38756cb77f98501cc49537356 SHA-1: 6aa29571640c8fbfb1f4d6ccb9a1e05d180ea166 SHA-256: bc849e7739d1743a7080d66990bba2ef145ef9d5feb5bb236fbfd90e60f8c4c2
156 Risk Score

Malware Insights

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

The PDF 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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://z-sinpro.com/upload/files/13291947027.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/169030c6acb4cf1d35713e38c71d6a79/26307667852.pdfIn PDF document text
    • https://t2sc.me/userfiles/wiwitigilu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/84581857878.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/86713569622.pdfIn PDF document text
    • http://ippon.lv/uploads/File/56912416765.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8b2250600---63756031251.pdfIn PDF document text
    • http://waypl.pl/upload/File/43401237035.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f054f0f6b---nabuwu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4e4qr3k6al9bjd8innmuu0fq26/587608944.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/79320099613.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/514622njv73ukag4m8rr83h5c1/25836844980.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/44083359773.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/rorijotoxi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/jazurefodegogenowak.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210731_230306.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9b014b2e03f2b4edf3749d8a12f14317/jowupovavife.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/97951869788.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9a511781---5996804714.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/59f5ounh3mqk8sn7ffndkp7347/gilikep.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/peliwan.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607542a71399c---15604754096.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/lotakatud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=poetry+comprehension+worksheets+for+4th+gradePDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 11392 bytes
SHA-256: bbf7098cb13cd6e18186e246b547cf11c64e5ff769ab989ae70deed3d46547d8
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 17504 bytes
SHA-256: 4f446508fd4a7e67c90bb23ea048f45dd4035c65ee3880ca5b8250cbf222b0ed
font_02_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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