Malicious PDF — malware analysis report

Static analysis result for SHA-256 883e6bd581cc75c0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 03:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de37aa4b3ea8506b30e01063f70d7576 SHA-1: bb21abb76ed187e4fa36a07e5a0d4cd20282c55b SHA-256: 883e6bd581cc75c06efea37d0e207120edf863129ab1c5fba785adf156e786f6
236 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'LOLBin token sequence in document text' suggests potential exploitation of client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=diabetes+mellitus+ada+2018+pdf PDF link annotation
    • http://fzcce.com/aimgs/uload/files/24091521761.pdfIn macro / runtime command snippet
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2c3f64157e1729fe22404d96a1396592/43185669167.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18d5f592---jugokedepewiwada.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fizakemojopabigaj.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/tidaragis.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/koxujinegafaw.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7e08d268---nenubekozodemefijituwipik.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/39663065609.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/mimitukudoga.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f575c03645f---17850037379.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/cvoktjsqjvbd55f6chl5uh2bv7/dutonivamonisi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a9caa5321ca9ca227252f708eb6a0159/13409751609.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/448jmih3brmln2cpktheu6ipm5/38296627623.pdfIn PDF document text
    • https://unosms.us/userfiles/file/7672943286.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/rowumuku.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44dec0d11---25407871314.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/nadejit.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/aeqrdpp90fvikjrsrldmui3i8c/78651160122.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70467911492.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/87340565257.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/digajopoz.pdfIn PDF document text
    • https://allytemp.ru/uplcv?utm_term=diabetes+mePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d94051feccc0f39427e74b7bc1486198/62796306851.pdfIn PDF document text
    • 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_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 11076 bytes
SHA-256: ceceaeb2abec4a4aa0452d907cf7c35934f9700db662bd07a36a2d161aa30f4f
font_02_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 16656 bytes
SHA-256: 310091e95dbce5a6895af243d654f5087bee49c5f9bebb138d65f660e16b8815

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