Malicious PDF — malware analysis report

Static analysis result for SHA-256 975e48b143686e00…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 05:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 487e64d62c56294bf274f7261da0847f SHA-1: 0c208a51f1168ff5c430f07da1fef1f3e22e88c1 SHA-256: 975e48b143686e002969a0e31de483171c7e68358fe4ec8fae1fe185690d56a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alexandercdg.com/clients/36029/File/19384206245.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/sogitevikegivuladanaj.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/de4d6dcfbc24c84d2a7d5ed96b6ac058/32209276949.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/31429748251.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zegonawalovepenomunonasu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4cfb40e4134c44b036dfc3bba37fe6bf/77299313905.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/424b4232477f3beb41c31acb40eee679/3554398755.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/dijebesavafoduzeveke.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/98892765828.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38e551233---63458507972.pdfIn PDF document text
    • http://rjt1.org/upload/files/jakogujimak.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/lunozirixowupax.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/jazijapefawijamalizoku.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/pedifofej.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ac6130f2bd4f0a0f5de634d68c34a1ff/bejoleravesi.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/19171200186.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eacc7faef---rizatu.pdfIn PDF document text
    • http://888chji.com/userfiles/files/80029737162.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//11154274008.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/75cb6866bcc2ad1c061495f73b57fdfd/sorokasavuwafalumibux.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/66971085217.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0c92b47b0760b9cdc49f19e25b55f6ff/26037944991.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/edb1a86d42788899145d96ef1179fc27/levezenat.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/donariz.pdfIn PDF document text
    • http://kleiberit.ru/files/file/mifigewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lenovo+thinkpad+x1+carbon+4th+generation+user+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 11548 bytes
SHA-256: 79a48636e22916c436502ba74f485249cc41cbe8aeeb761686ea57e579a9138f
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 23000 bytes
SHA-256: 7bb6c4c8ce0bb3f9b48be25920b5f7b022c1225a0c930be3fdddbe2033181af3
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_04_sfnt_off000139eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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