Malicious PDF — malware analysis report

Static analysis result for SHA-256 c566a5a6431a525b…

MALICIOUS

PDF

156.3 KB Created: 2021-06-09 07:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 03f51ead180eb15160930e14e1cf4b73 SHA-1: 59cba03c0195057e81b2b0f8543e6c658d144d8d SHA-256: c566a5a6431a525b1ffa8d4ea626b96903b6881f1f1708e90a192056ecca1c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=prodigy+graphic+novel+pdf+free PDF link annotation
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/37959107e5bca34d88f37962983266d5/30695314673.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac239634ded---18995270588.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14i1il2534ch808d2e3itfvb4o/tusesapixibigitumuxu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/fanabo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2776959b1---fuzijanun.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/41914871584.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e594bbddae---rikiwakamotikomuju.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d30a6d5b4---9791313684.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zopejudefunogunojekerak.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/zokatewesapesib.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc5d12853---dugumeliler.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/9469987663.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c2dda62660b141e31bc5594154b161c2/todonelemegegoselimukej.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c44bc82c38---weguwubigomojefogowav.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cbd33081d5c7c89761fdb44958df7f3f/xesilajupevagudufalu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/28fb2cb1fadcfd640a0a170e6fcaa546/21086551957.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae21b56eb---pijajozixevopevavaxa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5116d11f4bf5156aa84d7c74beafc586/3501381455.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634b5c2a9a---18540951840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D26 5112 bytes
SHA-256: 2a01a83a11d7c9f1ec0d5c95f714e173ae43fd6c33b14a9fa3caa4ca92f75e6f
font_01_sfnt_off00022e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E85 11708 bytes
SHA-256: d16a4b488fa6577caff3882f591f0106c7fa9baf37c2d79942295e2196d064fb
font_02_sfnt_off00025595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25595 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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