Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b427a187fbace…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 03:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bdf2a746ac172c2ff2ac01d37097ee4 SHA-1: 948a01e766cc7cc15fa74c1950f75395dbbccee4 SHA-256: 645b427a187fbace59260eca03b86a28caa139f01710ea49be693df5216f18e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. These links host other PDF files, suggesting a chain of redirection or a distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb945897d---37028916490.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607551978cb32---30019432405.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4085ce82c26f837f25d13aa5941e726f/22527314301.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/tixemexixidife.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131643bac07b---xepafixorusotifanajuj.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/98385423240.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/2470123618.pdfIn PDF document text
    • http://capri.lt/userfiles/files/rorabebusisapirovuwinin.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/76819947322.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dexiduno.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/bekenumolal.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d75dd1e9d9c5ab605dbeec6af1ee7b69/22510723258.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f7a515361---35015069225.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/37646214477.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/gomusuwopob.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/4647420848.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/11289688359.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/gufukupibod.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cb810daef23d61d6f92db56ce5c3d2e1/93197507934.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/derej.pdfIn PDF document text
    • http://lblussana.it/images/file/tojapixabilasamof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lenguas+mayas+de+guatemala+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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 18996 bytes
SHA-256: f9a0ca7063d03070dd79b1d6df222777be212ee2bda6f31e798230e8bcaf809f
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 10700 bytes
SHA-256: 574a82e4cfe8bfd2acdda9860b28d142e118e8eed5b44075f592717163f9cf2c

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