Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5686f28d219e82…

MALICIOUS

PDF

84.0 KB Created: 2021-08-11 00:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7e54a775fda9eac65004cf44e49440b SHA-1: 11777162b925bb333ed0f5074cc82dc3c2c616ca SHA-256: 6b5686f28d219e82e03f661c0c355312fc527d011d095193662231626b2b818b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://africa-emergence2019.com/userfiles/file/jinukigezasegojexigivax.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e942348c8---75560759072.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085a969b57f---88287051444.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea14d5dc1---fafetagevenuje.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5ej68tie2e752njmfqm0p3jf5m/zasojato.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/96110962794.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/38597513157.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/sudomegamosenote.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/bowumipat.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/31540282536.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kiroputefipakizumupisi.pdfIn PDF document text
    • http://ozari-ua.com/files/file/82262728449.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/34959113525.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf6c4af7a---xisedatan.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602d475877---bopavener.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab47c2085---21159458053.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/usa8tocua79m38ijg6gcq0ohp1/4952255525.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/12302831885.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/55a10f8b84d48e003013ebdcf1df6e7b/14879125452.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/717b4861978d1c7808f6298b5cb36868/76881363919.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607146e365034---lolutikug.pdfIn PDF document text
    • http://ruresept.ru/files/file/55034006308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=m%C3%B3dulo+5+actividad+integradora+2+semana+1PDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 11316 bytes
SHA-256: 62a895304249c2df829a84e7129c2cd5854cea08eac256119e70c6a9b8876d37
font_02_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 18624 bytes
SHA-256: dc83cba6d847a8d5e8edd440466316c17c63e73d57a2cd5f114ef7dda47f1c17