Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9321dbd8cb1b4a6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 09:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6844f7cfdaae9e65e8c7740bd0a0f527 SHA-1: 40c9c304e30a7b0b23d9c1bc0fb86a06e685f049 SHA-256: f9321dbd8cb1b4a60c82a34c999cd34ee01f0ea4c34ac4b028488289092d5408
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The PDF structure and link farm behavior suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://anipetkingdom.com/webroot/img/files/61685698859.pdf In PDF document text
    • https://stancijanegrin.com/UserFiles/files/gelom.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b645bbfa36467786255631b96f591bed/zojij.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/rifugokelizunafudubozav.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/foruvixar.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756ea69882---vipuf.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xugibesezuvagi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef306bc1063370419d690a2d74b46569/95648131658.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe882662e---36693596358.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ok3mk5pmacggla25lr9o81tks1/xanepipuluzedejaguv.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2a2606770---3679363558.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pafekoxosepobok.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/salenuxojodi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/kuvuzuzu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mawogevepupidej.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/32375708790.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/16772208238.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/24993722000.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/betikovikuv.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/demim.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbea0cf5bf---tagivuzutamibetasoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2014+chevrolet+equinox+owners+manual+pdfPDF 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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 17388 bytes
SHA-256: ff661015aa0a513af14de2616c481702949b0861300e5e6310757936d7a368dd
font_01_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 11660 bytes
SHA-256: ba74841cc3555c6ce3b4bb8908c91cc34617907a5198e5e236ac46d1ec67e1de
font_02_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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