Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad54644cc063e763…

MALICIOUS

PDF

85.1 KB Created: 2021-08-22 01:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d1be93f5344ac17e1641f62b2c9629f SHA-1: 57ba2cf52c1f14a3539eab3dca7517fd047464ab SHA-256: ad54644cc063e7631f347764d7264f6bb179d4a8c9e66a62e7387808ae05ca99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing by redirecting users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ht9l2u7js0aekgj7vsavr8da4p/31510697433.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/295f6e0bba67248555fd687952c10baa/34644834002.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7gp94mmbq3u5lvegmi0omb81ep/62885749895.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/1171413415.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dc345653---forafuzilote.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sonofus.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/winoweti.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6cb577d26---sanex.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ba086486b---wajexawiragotevefiv.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/dorifigabi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c0ae13418---18487537720.pdfIn PDF document text
    • http://chinalabware.net/d/files/kozejaderopawuniwat.pdfIn PDF document text
    • http://esejsc.com/upload/files/gemijozan.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/dovopawiluke.pdfIn PDF document text
    • http://wwstationery.com/files/file/nirames.pdfIn PDF document text
    • https://fallsplat.se/file/99551835917.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a1b456c907666980a1c419cf3cda095/39537907916.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef377bb4c2---31065449666.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1f5f77ddbc118c2134cbd263ca4ace19/gujuvodubuvoxifakudeb.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kadidadizetagik.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970c5507639---bunonowawokali.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uq97d9nei5gs2im6s8mta79t03/nasudopobudu.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jamagatidataxato.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/39707146116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wwe+mvp+theme+song+mp3+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 17052 bytes
SHA-256: 7540e1d47c4f4f7cde869164ace2c181885f23f5b92ef4c4b827c03104dc5ca1
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11172 bytes
SHA-256: 2c817bffa9c9b94142246ff05a2d128104c47fc0f976386a9605f23d04ec5d43
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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