Malicious PDF — malware analysis report

Static analysis result for SHA-256 95266191c415e58f…

MALICIOUS

PDF

103.6 KB Created: 2021-09-07 00:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c298ef7e6baad437ededd0a4791a9f9e SHA-1: f6d48b437267471b135346271e0fd95ee138c75c SHA-256: 95266191c415e58fdd3b6df3b53c0153a8782aada85a69901b39295e4d9d0b0d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of PowerShell commands within the document text, likely used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hogies.com/includes/template/uploads/file/teburonapowelireki.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b9512069d679136ae9cca42ba1b65a54/wixunezifaxup.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/34a4458f2c1a0dd47998ae63c7741a19/3394137287.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/90152463500.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/baxuwitabixefovakame.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/kilalojukinamorisedoxa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbde55a0bc---41731224572.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5c0c26886f3b3e454c5cb0ed07f0becf/xebekede.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lojez.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/6658371751.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/vukogojalipes.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/46434197184.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098415f43f3a---17172326295.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/50107639393.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/ledejafimok.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/juzepepoxogapad.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/nifejabezupulasolirowa.pdfIn PDF document text
    • http://tmtteks.com/files/21945024954.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/42799500634.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2ab4eae10363a501a1da1160b209cfac/wigaka.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/11347220675.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733bbc9ec2e---48149388998.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/kajifevisibefokazubub.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gisejujaziv.pdfIn PDF document text
    • http://mamitobe.ru/files/file/35377262064.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/27589822962.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7750dc89---jivipelogivavibejut.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/wapuvifexejixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=generate+pdf+from+swagger+api+documentationPDF 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_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D7 11140 bytes
SHA-256: 4abb2228a0a9ca2d60e2e7f00b620b7a21778aad35d727b2f7dcf0af75a47744
font_02_sfnt_off00015bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC3 19748 bytes
SHA-256: c0d4ce07197ff68cfe740e67e9f767ad9a8bc357f35d265f7ef0ee157b869092

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