Malicious PDF — malware analysis report

Static analysis result for SHA-256 f517c42336ff5bfd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 04:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63cb3cee0d9c04de55cb7bf5c13fcdd6 SHA-1: 8ee508fc7da5b7f842a952a29597b52665d46ba0 SHA-256: f517c42336ff5bfd09509c48298ec3b37af40e35688008657fbe23f8227b3af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9940

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 http://naturabliskociebie.pl/userfiles/file/31272900447.pdf In PDF document text
    • http://altinay-law.com/images/file/rifupokaxunu.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210807022027_iz4vgk.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/juxarivakarevo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b620ca35ffd---18955665340.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/batitolodupol.pdfIn PDF document text
    • https://cakkue.com/contents//files/fededopome.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pesaro.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/noxiwetezoliw.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/fadonanimijuvoma.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/86324817469.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/69082451826.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/44985646089.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/104a639a96e2af96170a2b3dbf12181d/jiluriwetuwitalijaxi.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/17469430090.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609550089dc9c---papimizenejusug.pdfIn PDF document text
    • https://artenika.pl/fck/file/69632872288.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/lukisitetipejawu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f061grb1mfhjtu7ka0gtasfpup/nuwilejoximakokata.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/25134101886.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kizobe.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/988516153894e75757112a261cce7fe6/gonakuledoguzigan.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7109d166b1027738f4b1c8a409c4af4a/64112620253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=american+english+file+4+2nd+edition+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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 18844 bytes
SHA-256: 90b497d6f0f45e435cd85f1971aaddcaa00b77b1667584da58632293d8b972d1
font_01_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16300 bytes
SHA-256: f204701f64a3b315aa8ad7e6ea4821a882d05167a902e48e8e9f0807979f9d71
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 11244 bytes
SHA-256: 92703169d0205effe503a91d3eb14d96db2e6998bdf1593cbdf51bd13a08fe47
font_03_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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