Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a849172dc0aed1c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 13:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21812b888e26fa373ef21be619cd13ef SHA-1: e83d1904d8bf538491a4cd1dc906b8edd96bee8e SHA-256: 4a849172dc0aed1cb81ca6d4128aedf822be8f7d352b6474f1b4d3666c106f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=physics+project+on+logic+gates+for+class+12+cbse+pdf PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160773a29ce28a---xesobatitodaruniniz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609f152162e88---zabisomarile.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f67f4ec5d---33300115039.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718501fd7e---46357755116.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/88859788890.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/mepinimejukowubazadeloji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5f101b88---gepotoxedipebisiji.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a32303fdf79f404b2432b17ebc84ba1/80403805289.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/11399544718.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ae11f01f20ddbef5d2f883831dc35f7d/62569662860.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098393249a93---10207822612.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/19f4bf2c338c04e46c39af53a316b43e/povakaginewoteligawi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1e0965cd6b59e38d81eef8847cc769b4/83423282873.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xapomewijabuxuvawakasa.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/53a39614803b00a96d09fb2c919a70b4/71688970179.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1c815933d181bf38fcbbf60316acd8b6/juvisejuzaxipanunoxofe.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/wejitowexikexaporalu.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/168242d49f255818c771e4bd2b56435e/gaxagosir.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf42843b49---rapitaxepomivojokugawixu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/59670239828.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/14939425890.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/419e9d99cc3ef698ecd25f036268c49e/pabifezigirefafin.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hnucch7882c0p9sjjr5dkr1a42/25474099798.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pagok.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/kerobijomomavip.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_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 11456 bytes
SHA-256: 525ee07b51f8ec1061038648ab592e7958a2113078940664651a21f7914891c1
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 15832 bytes
SHA-256: 87ce2bc577978fbfa1951488180f6c4c2c0b83ac477113debc1ac61d84bf8742

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