Malicious PDF — malware analysis report

Static analysis result for SHA-256 f803e58d97c98d4b…

MALICIOUS

PDF

81.4 KB Created: 2021-08-06 04:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5b96deabd924f5f91cd32f7696dbc3c SHA-1: 9a08eab9fc19491a8b8104be4118b76738371e57 SHA-256: f803e58d97c98d4bec8cb51fc9002b5b82ae9fc4352eb291a9033679035e4f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/9301ab59b83f6db45a9935e734de9dc0/90796924349.pdf In PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/likofebubomoredujosu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/debemi.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/robenawelexowenuli.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisifuk.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9ed1044d---povugewepejolawegixofuvam.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/54987569707.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210531050343.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc40e7bd6---87806771598.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/34223915090.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e5314d71---pepepaxawijipejowono.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/81131765795.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/77997558201.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfb9770800---8789734622.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/71511363809.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/19584658686.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c4256bdd65d83e72d6076cafa5f6dc55/59312213449.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/36366427317.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/rovejude.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/dulabuvarul.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/79213669579.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb89b3ef11---powukesupibivebexidupew.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/86281335648.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa700102966---lowukokabumogodilabonomit.pdfIn PDF document text
    • https://autoparkalbanese.it/file/newofepaxida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=solutions+manual+elasticity+theory+applications+and+numerics+sadd+3rd+editionPDF 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_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 11240 bytes
SHA-256: 6ff321c17bc74b64e1b1ee006c39c310ccbeb871a6678efe10b7549116623917
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 20672 bytes
SHA-256: 330c5b8cb9a3e4eea875ee4b5c049f4f96d0d5e89405b5102f44e89f1f9ce172
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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