Malicious PDF — malware analysis report

Static analysis result for SHA-256 290f8921a718d051…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 04:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95c1ac9fc15828b4da40fdd942802a9a SHA-1: 10b9a6eb1e5e8907235def50b048cb29d65ac236 SHA-256: 290f8921a718d0510d498dc10918dbb5b3e29409efcd761eb3ff1dff0386be36
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple URLs hosted on compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of numerous unknown URLs suggests a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cddb1ab29---81999201666.pdf In PDF document text
    • https://mangmalungtea.com/userfiles/file/kupasogupe.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99609745f3---73299030992.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/98818111916.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/15899129390.pdfIn PDF document text
    • http://htygroup.com/upload/files/kafikaxusofelurumebewuju.pdfIn PDF document text
    • http://apismorava.eu/docs/27018304336.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9a23d0ca9---pijakufapumabojileremozag.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/peruzijubu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f222c1f293---wevusad.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/welujan.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jakun.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/giposepudekuku.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/konak.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0119f8e5---timedutajudazakujab.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/waletezimiraxovelorezula.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dibetijisuv.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ittkgm6phdg5hb747vmpeeu4n9/lilarivenomitiwuzi.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/74332107050.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/66621977.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/juniv.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/85126841635.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b36561826119685abbf8c512d57331ad/62752969529.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/39727145078.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/41726090053.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/nimomikup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sociologie+explicative+et+compr%C3%A9hensive+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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 18728 bytes
SHA-256: ed77b22ed337bc298c5879e367eccd32695db6756d9060d4a0c6554fad39c208
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 11464 bytes
SHA-256: 6024d061604fc8630c56548a71b3bbf90b60d53676c0a1524b34fa4443da2d85

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