Malicious PDF — malware analysis report

Static analysis result for SHA-256 11848f11f8de2866…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 07:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f127e582d2e5fb169fdd9febf7ab1b9c SHA-1: bfc04f92589a619c3e9f20fd858d5233b0378145 SHA-256: 11848f11f8de2866efd7532d79ae088b5bb49d700c38bab4a2ed32afa1f77181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to numerous external PDF files hosted on compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The PDF's structure and embedded links suggest it is part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://anglarill.net/userfiles/file/narofakefe.pdf In PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xusixolevubasirifolexi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wisuzidexatan.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2741a068b1ecf01919172a791e04f3fb/54581953959.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af52347c8---dukimatozujibatakatajugev.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/75276636813.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fff503a6---38964791394.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2a58bf73eed3dda018e647b4aeafcef9/lurezanitujov.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/bawijozinemogilafuze.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5d8dce7eda9e65bb680877084f83a7bd/32715234928.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070415da8016---14797603186.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/94075062283.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/13254306797.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d967f386f---1721819228.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/36593616539.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/82991702551.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/207272589060cda967cd374.pdfIn PDF document text
    • http://standardamulet.com/files/files/16124458036.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/fanegasusavenadeze.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6825c7dedd57fe89a4f7ded6002fff3b/nuwoditejafawirobojerevaj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/litex.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/56919842853.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/bazimowa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/labazava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ricoh+mp+c2004ex+manualPDF 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_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10840 bytes
SHA-256: 6333181b0764e8bd059a50f2fe40e06744d80d657b6bd4aa21aab50a2c3eb365
font_02_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 18264 bytes
SHA-256: 841538f5634ee4156a86e5729ea45c2dcb01a1780db86c5bcd118f25555251e6

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