Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4f7176e7dfddd9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee8b39a7e4a2447ff3f16f0a23fce90c SHA-1: a45fa4a7b4408732718ec353c50144778fa4fadb SHA-256: 0a4f7176e7dfddd9f3c2f9b53a61862904acc252cf36fb254efb8be6304b00be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or link farms, indicating a strong intent to redirect users to malicious content. The document's structure and the presence of numerous external links suggest it is designed to facilitate phishing attacks or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=iptv+cobra+apk PDF link annotation
    • https://catequesisnavarra.org/guiarte_userfiles/files/51883519884.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/zulugezomuk.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcba18591---gogivuxaxaran.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ecaae8a03a96ee6a4a6ae783dc973334/viduk.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/gunaxebaredederololegoso.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64571252650.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/xupaj.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/32938789857.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/73098836128.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/57771387295.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/77422279761.pdfIn PDF document text
    • http://symbolfoods.com/files/file///67537210911.pdfIn PDF document text
    • http://partnercable.com/files/99221961374.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/wireporepodoxotap.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/muvajujozunujapipuzulezet.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/20516659920.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210909200812.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613094f810af7---maxesifowotivipipuzez.pdfIn PDF document text
    • http://fteq.ru/files/file/81600741392.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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10076 bytes
SHA-256: a3f84a4ebf6059a695c861b4992ff90eca949b30fa397e1799b6e32f13401b36
font_01_sfnt_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17728 bytes
SHA-256: 40e0bda1ec85a3a8a90a7d2d6a1662540f1dbeddb8086752d1eadb38564bb324