Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5f587c4a471d5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 01:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3ca7ae1051e2624a5bc902881e18840 SHA-1: 801fdcd69cfe0ef854290de7bf5002d9d68f6f58 SHA-256: 98f5f587c4a471d56b2da33d1cdd421aea01119c726db8d9334bf4b720f9ad11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI indicators and link farm heuristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=eritema+multiforme+ampollar+pdf PDF link annotation
    • http://www.urbanwaterways.info/files/gifiruxebanubogijo.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/7744958424.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/81777831501.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73836d73c9a3dfa16da5f22b9fe7921f/21290632479.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/86727631600.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/67348212287.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2721270102a8c57747dbc92cbc67a902/velujajomimupomun.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e45b192ce---bowiso.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/43563444862.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/rezara.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078496ddca2c---53525446984.pdfIn PDF document text
    • http://emannsltd.com/userfiles/21786893778.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zedotu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27a1a3384---pekujodubuzuzunavula.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5f14725eb534cd6b8aaa8baa4c347920/14763289724.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zanukuf.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd01ebb429---96329628241.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5f1830f45576e093d83804d5db4b544c/13839038477.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16101466b40ad6---mafaxuweferobutazugil.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/sinofewumip.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qlnob524uja7fi2gf2bsuvv3ok/92470452406.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0lvcouj0r3bg1g9po46pmc3qr3/fawipatotibofuvakago.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/votufiwitivexezeloxaxi.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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10468 bytes
SHA-256: dc7ea172ddefe227bd730a114a1bec71b8c405fb25735929aa3e0ed2526b9bec
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 18944 bytes
SHA-256: 03a5743fb8e6f3b42ca869deca3a3d0ba482113640bd6853fd986d6d28d0162b
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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