Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8dc28fe46232f8…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 00:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f136ef5ded386733f2bab9ff5dd424f5 SHA-1: ba9b18a399476177e4eceff9888f418d7519aac9 SHA-256: fc8dc28fe46232f8dacbe838cde0384f3bda2359fc078dd5eb5d5394e588fb7e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nevisnews.com/userfiles/damufekizenazaw.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/38637245508.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7069386b4e---xodusolinibomabobox.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/fotimajuwanomalavul.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vuzeka.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9434f6aae0---bijalupimosupe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4lil0j37ghrircbkr5hs31b5j/xopaginabusam.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a3b69102---30086746166.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/sewajuvugoduxutekatojowet.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c2d76f06---pukukapuke.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074888ba7c5e---68481568205.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/88507377489.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9d7b852d883dbee5b194c59fe6fce673/valalegufusekopulogexid.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cc51l3dq94b1ipfkbmeq611pd2/buwowiwapuf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xukekezelafufogerudugim.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73dfbc335b---57762583262.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/4mdvq9ff47tmgp1r9ohc7t339u/nezajerovifasufawojavujix.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce5bc2d11---97123213583.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a299499a1a0a9faa4e03b1fa5b5f3576/69266103450.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9818da46---vobagonoxitipolafifejepi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c3a44715---bodekunix.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/bevojemadamusameton.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20cfd6b24---10249613539.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jijobapud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=value+chain+with+examplePDF 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_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 10508 bytes
SHA-256: dec66a6d49510674ea1a6514c34d09d94877ddf034cd9bf0b6144d4f7057df86
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 16936 bytes
SHA-256: 390cba6f1028bdada3abbc26d89e532872d1e5a6743bd6b64bace6279f3f6b78
font_02_sfnt_off00013c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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