Malicious PDF — malware analysis report

Static analysis result for SHA-256 237a52b3d7b4050d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 01:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23a6001b445b880a375b98f21097143a SHA-1: 4e56630092b56c2488175c392300fe5bcc1aada9 SHA-256: 237a52b3d7b4050db1031d5a3bfa60e87cfb43de5803be876ff362fd46ace47c
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tpdw.pl/userfiles/file/fawegijabodeluvejonawezo.pdf In PDF document text
    • http://chroscina.com/userfiles/file/zixezasajipix.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/12731415730.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972f372fb9---89611099254.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/25705952504.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786dc1ea979---62394512478.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/63132681820.pdfIn PDF document text
    • http://compsult.net/userfiles/file/87410751820.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607def7483ab3---bozejuwenu.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/sasejetirijorovowuzu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c6b98e63f8543aa3be8315497a559abe/lesezitumetanadepamemun.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mefimesomitodinunakezo.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/54691995057.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3053fa44---36838565368.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/36616558442.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fsn4k7ere50dp7c0siibv2os6/wagonusivizowijazope.pdfIn PDF document text
    • https://brod-plovdiv.com/images/35327224995.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/duzunibinudelalodex.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/46357969166.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/dolebo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/walereburizovutiwuteridez.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c412c9785---57536824681.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-5/20210805174540956586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pancreatitis+physiopathology+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_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 11012 bytes
SHA-256: daf51871510f03c3bc9fc8475ef781d206bb71ee71c175bcf7b0adb07d034d83
font_01_sfnt_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16760 bytes
SHA-256: 1ddcedfe5f2824dc7bc61c8bf9c2c0ea560203e2b2b58a83114fcf33dc169f8a

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