Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00235c9bf769286…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 14:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc0d8e2b368993034be4f563198faace SHA-1: 449efbee646ec4e32c59fc365f5e7ac4484a6852 SHA-256: f00235c9bf769286d47d0a620ace0991d24ed74c957fbfca4c682ba92c0b564b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=how+to+get+a+wifi+password+on+your+phone PDF link annotation
    • http://seoaudytor.pl/userfiles/file/26274046760.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bugupokagudaxugobazapa.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/juvet.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nimusazawo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/tavop.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cfd9a9f8---68934855202.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wunufijepejimilazif.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/82216273009.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/9201360026.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/52739563842.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_023045.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cd523e7ab7e9c24f32d5bac00e12a2d8/bewibawasedonisumekona.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/53481030907.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/pogegalotigigi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cf2ca85ca---tolifatali.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/wasew.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/mopexuwovijilusa.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/zipumuzujoderumuwije.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/16718350569.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/11780742971.pdfIn PDF document text
    • http://talleresjpg.es/img/file/lixunibosimobowi.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/84686636302.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/79891228190.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_off0000af0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0E 11020 bytes
SHA-256: eaacc353dcf2c9856f5d69da4aa149068e2f443305a5f70cb3b022dc7d0c8fca
font_01_sfnt_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16312 bytes
SHA-256: 8cba856ee334e19f81223a130ef7d27384ff0cc7a3ad2132c8e9010cf772ddae