Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c35c26496c9f0d6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 13:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c1ef3562bfa9fa3401ec46dd414ddec SHA-1: 6af3d90e7ef616def280ad828600f9b049e8f463 SHA-256: 1c35c26496c9f0d633946bf1c59ec21520a2e9c6c34431d56ba1216479aafe9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the malicious nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094fa7d3667---razesonalofobagoxet.pdf In PDF document text
    • http://pospatrans.cz/UserFiles/File/29999430304.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/6351344556.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe498c926---farigabuwonemibo.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gatowatenekinopareju.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1qi5d24m85ppgevpt1267446o2/vorexojowenej.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c4f1e8773ac037d346cdf9124bab39ef/98501827750.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j08ptje9o7bael8l4nrrq28icu/26632146383.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f44e14a7c---40428793116.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/xemewovaba.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f23813b7---58452753201.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/85085727919.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/66850822672.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a450d9e91---pexolilupalem.pdfIn PDF document text
    • https://ecoretras.com/file/tipewunugaladixafel.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/lepimirafevodezuxilituja.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/resajadibutujegalad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oarpv877ronsb9l59b0ol32fe3/zotegurizafukiku.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nasamivijujan.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cf6f22b6---34722282452.pdfIn PDF document text
    • http://coffee33.ru/archive/file/velewodexifukugerukafobol.pdfIn PDF document text
    • https://rjpexport.com/files/75065537024.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1640f10852---49422652080.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/544544b19619970ac317bcce4d194f43/literokidotovowak.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c6e2876c6d8e613525e4c2a51ff90569/giwadopironunopobezov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sample+network+diagram+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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10928 bytes
SHA-256: 8657fe4c619e9cbb28b5dd1c8489d8e402c61b36edc19f8c83516df5a35cac97
font_02_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16316 bytes
SHA-256: 69fc2bbc917d1f1f035ae428faacedcbda615a4f79fe66736a77986074d65da4

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