Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a0d543a5e5b594…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 11:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 242b279952811ff7bbb2e3d5dd9d5255 SHA-1: 5e7ce2103a9a88cd62d0e6c7994472dd8508256a SHA-256: 70a0d543a5e5b594a90544c615196acbc4e8305f768c6e4f27d27aa453026fb6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://matchonusa.com/uploads/files/51172521088.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zeriziribuku.pdfIn PDF document text
    • http://szhlfz.net/upload/16169863914.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/32921121070.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/88620108183.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/25571253519.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/75515790914.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_52AADCA3A535ED2B.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/91010875267.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333432a1a57---bidaxinuje.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/97543782623.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/juzusiketogezojekenepure.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/71995622302.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/73159359149.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/xajuvedikob.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/vatufekapawumif.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/juzodadixozimutamekumupe.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/rurowivulilasafixajimek.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549e1ef2ee---66455705525.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/viraxebo.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/54014526727.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5457c826152267d1237400a95a58cfcf/61347480173.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/19811881858.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/ledewebezojovadefu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bfb2b8fe---jajomitofigugebitojezoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+grand+tree+quest+guidePDF 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 17160 bytes
SHA-256: 55958af26f882760f71a5d089ce0db820e92714a3e370d8964a4cab4dae4e8b2
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10568 bytes
SHA-256: 6d1e38ac9d5a7c329be12e1642ad35009a262c87729697a0acbeb9e28a022f1b

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