Malicious PDF — malware analysis report

Static analysis result for SHA-256 2679707fa18b246f…

MALICIOUS

PDF

78.2 KB Created: 2021-08-15 11:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d02eef4e1f8fad6bf50118913ccec949 SHA-1: 57808bcb4ca0706f19ab380ab6e6e7930d7d002d SHA-256: 2679707fa18b246fe6374d4448ac73a8f047ce06275c889f04b36ae187b43d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/k7mlkttjd5upaialh2oms5bgu1/48895110763.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/48831460353.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081795342ec7---30551948051.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/tirunijitove.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/181256867.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/734803196.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/77847352926.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/marolipe.pdfIn PDF document text
    • http://npas.ru/pic/file/9628981966.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mojaruferuw.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/zutifaxerajatow.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/de962478172be97c05dde48b601c2d4e/19414281023.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/m29e141et2i86vphva30f80vts/gafilize.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lqlv65r4ekehuim4dk2vdodbav/zeganasulokamudipixajasa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a36f0c41d---luritumetafusadew.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c2783db244b417c9c14f6dc60bea3bc8/6863774613.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/susebiposogeze.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7nnkcele8vqffnde54pfintdu/puwizomupejanez.pdfIn PDF document text
    • https://securitydm.net/slicice/file/35635568835.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fe95fd1b7f702e7369ee47ccc8269330/78441653236.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bipakubel.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f14ed9bf6f3546e4673f8ea6b576e903/90836362050.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/40848821488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=genie+garage+door+opener+reset+after+power+outagePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 16056 bytes
SHA-256: 5330ac084a442afd7b3c08d088e5c2fdaa424ed6e9654739c3d5bd088c8fec8a
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10852 bytes
SHA-256: 23914e6d0c4a5f119309df95a0f2c039f6797c727a6e3960f162de9e9aa3df2f
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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