Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4c0888979fa4a3…

MALICIOUS

PDF

90.0 KB Created: 2021-08-03 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c4064fcbca9a673af6df9c874fdbf47 SHA-1: 27c73dea3f98a1fc47ac15611014615214a5bad0 SHA-256: 5b4c0888979fa4a3f92afda580749f98da5fbe099e5d4d4273a12e986016bf9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/979458b8a6eb40b1c9493cd04a3b9b07/fiwewa.pdf In PDF document text
    • http://centrons.com/uploaded/file/86021950960f00ce90d670.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6fb42334bbcfa05f6f7456dbe6639489/94234929873.pdfIn PDF document text
    • https://ikima.fr/uploads/file/37425254610.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2317cd8ee4---13860444066.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ec66072ed512344e5e3b209d6cdcb373/3822625117.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/nisufifumifevasodefaza.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609abdab56576---58226101515.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c16cb21d6---lugisimodepuke.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/kabikudek.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/47751606261.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kovilarivivotenoporijed.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/vuxejibulusinoli.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xugifipivodefaw.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/refudufulawevejufepev.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9f15754256bf2fb534e6fd585ad918a7/nafakijotavajazixod.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/zusavufibogexasiwojedeme.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/vapez.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/zetufekewuzojukorefoduz.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ganipiwokosinefupififen.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095d554352c6---7849164749.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ralimorebisodiw.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/tuzixenomonutidunerisil.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/rapedejoromobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chrome+canary+full+installerPDF 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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10848 bytes
SHA-256: 5d5382253ce0ea5efcd2ca29d41701c43836807bfb1b035ee596c10ba46f4ecb
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 22888 bytes
SHA-256: 3adcb7007567c92b1f9266ed359deb1c51a3c0350326fe1732d70787e52b6bcc
font_02_sfnt_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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