Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5bf91625b17ba7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 16:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63cedea581535592b3629e214bbd482c SHA-1: b75ea5504843648c551d984bf9055e0d52777112 SHA-256: 0a5bf91625b17ba795688c59697b20369aface0e864f134ab41f58834f862203
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=install+android+on+windows+phone+lumia PDF link annotation
    • http://osstemcardiotec.com/files/fckeditor/file/1530180218613a85276c76b.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/31408746030.pdfIn PDF document text
    • http://tiquital.com/documentos/file/81605905940.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/jipaloj.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9720ba12---puxaziw.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b453edb11f---97187224488.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xamimuz.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/18892341347.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/56876775909.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xitawodurefasulawokofov.pdfIn PDF document text
    • http://leruichem.com/upload/files/77016793997.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/12964065460.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zafopasenonufo.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/lopipuluwi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f269836---nanutadupaloroxogo.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/kijadasakinijiviw.pdfIn PDF document text
    • https://ccskin.com/geektic/files/zenuduwilaxudisegadopawi.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/57843915893.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pafuxa.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/44392835310.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/wedizasirasugadokena.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/69761424512.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 17800 bytes
SHA-256: acad3293d93622ed868ad776c735c507ae2a16623f797da1efe2d4fd8ab70514
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10796 bytes
SHA-256: 8dd01549740d91cbb49fc67fb010dbd6e07b762a846bdd4e1bc3b2cd2df95ffd

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