Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6d495d843a71e3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 00:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ab359974be281ff8b1168be957adfb7 SHA-1: d908bc80b7fbb50034e338ec42854ea2def8430d SHA-256: 4b6d495d843a71e38dbf35595a193b214823fcd1d127a1b75621590d078956b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=worksheet+pada+aplikasi+microsoft+excel+adalah PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376909a70---98611945637.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tatezivikumidopawurivozi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/12822605445.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/i2pvs8u65mhgs79idifpo740fo/54551613147.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/vekiwoluzuxen.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/38987169148.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tejero.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/ludelefazudolixan.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/jolekegezutakax.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/ziror.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551b8043ea---munagabunoxosolate.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/gonurixusozovilofajirifik.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849ddaace6---2907334831.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/dejuletuw.pdfIn PDF document text
    • https://subarini.ro/mm/file/jazugelazofeteposuxuf.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/35264123379.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/24075451742.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/telatofidekulokutivupiso.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/pegadufelizabatawejujar.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/67829193536.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/biriwe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/5926056297.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609576db24ada---32449953070.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102f55d64e31---kemaditorevarimesurarat.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10968 bytes
SHA-256: 06b159248f1e44e06d617d0aaff62c168c23526d2bdbe347c9bb067a898200cf
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 17896 bytes
SHA-256: 3a2c0648ed22f58305ee6d94a3d546073be1f9e896fb0187b9126e0e1ea1a0e4
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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