Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59afd3691500a7e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 01:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59a0919c91c3aa5fa54123ab672773d6 SHA-1: 8350069ef92ec65afa675f073dc4059b256a180a SHA-256: c59afd3691500a7e103e8cbf7b9387b0b603b14be3b42dcd9c3af371f092f57d
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The PDF contains numerous URLs, many of which are hosted on what appear to be disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82de8d727---galow.pdf In PDF document text
    • https://palcev.ru/userfiles/file/popekilo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mujadapaka.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j2h7t0agogqsj38ld57g2350mf/86785308250.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3bed9085083fef42cf5fb88c73ed4c9f/75624641202.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/disaxogonijupotif.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/89580233298.pdfIn PDF document text
    • http://orlickachata.cz/files/files/19296959881.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/16216819574.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/35772835900.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xuzuvomavizos.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/mawawabimaxilaxozakodoson.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/81330354777.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff2c816ae---2473799545.pdfIn PDF document text
    • http://lagrupacio.cat/file/zunovonuruvadufiwegigun.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mixik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142710cab8e0---59764396560.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/pajokezaluzivadaxe.pdfIn PDF document text
    • http://net-marketing.hu/images/files/suxajus.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/34851706641.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5040254110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+dice+roller+source+codePDF 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_off0000b5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 16972 bytes
SHA-256: d8bd779a3e326c33f71c9ab12eaaa417b46b28f62751fb79a401c8c6e8acd953
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10184 bytes
SHA-256: 8dabffb6d52e0c9d20c02af5130a8e34f6851eda7c6ceabe0a2cc7aff6af3144
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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