Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bf0dec61b450b5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 21:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 417a27f5e2a830b58957807fa591ce5c SHA-1: 81a2cfe6903c955c49396b2c6e71f0082bd00e22 SHA-256: a1bf0dec61b450b5c16cbd2d2363fcd67245221fea0dbf4344066efc85b4d173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nriloan.jctoursandtravels.in/files/37472671334.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4e765ab9ad0b640a1e2b0f08ae448958/rupup.pdfIn PDF document text
    • http://agilesolutions.in/uploads/94161890032.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/91071506818.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7d726921---35238961327.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/95943008352.pdfIn PDF document text
    • http://palami.by/images/file/nugujuro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8152505c---tozizokexidofumufajakebo.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/76866009927.pdfIn PDF document text
    • https://aspirans.com/files/file/48849912021.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_4FD0BA4FE5A4B3E0.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/jologuv.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vozojukajoxas.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/34452700778.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/tisededuzosoral.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/febitip.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46664287554.pdfIn PDF document text
    • http://carbonelite.ru/file/volozef.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/95834423389.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/82283430548.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/33340269112.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelodibevupakoxoju.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/nuruluv.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/19623782076.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/59588964221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+recorder+apkPDF 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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 10268 bytes
SHA-256: d5784b4bf8fcae5a30fb22d7cbbc3cba750a2b790c2c79ef5db8f90c4fdd8c46
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 22336 bytes
SHA-256: 7bf7485a782faaaad7edcd97b7b4bbc367c09794a667e01abcb785f87280a02f
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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