Malicious PDF — malware analysis report

Static analysis result for SHA-256 e256fa79d2d366b2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e63f6b4d96c40e52bd9f18f5f30d470 SHA-1: dc1d980b8b23fa522344519a2f7c98eb19138f49 SHA-256: e256fa79d2d366b2d22ee383d13e9571a4f2023f1a5292142721da4befd34a85
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://myarchitect.es/ckfinder/userfiles/files/14477932274.pdf In PDF document text
    • http://pokeocncafe.com/uploads/files/butupe.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/89773946791.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/12762096990.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/57091418172.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/vedopatani.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/mavubokesoraroxijuribajip.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/36396236978.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/10034140658.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2957170---81274748550.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614217f7d7ea0---44978622684.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/fewisipapopapowekukofaxas.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/21027613915.pdfIn PDF document text
    • http://ha-sine.com/d/files/82266836310.pdfIn PDF document text
    • https://kham.vn/userfiles/file/vurodolavego.pdfIn PDF document text
    • http://annabarons.com/files/files/41942177978.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/35035479290.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210919065444.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wofumagudiw.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/bekewogakisolemoba.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141608b4e615---pawobuxaxulo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kagolimafizamovepow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=city+island+5+cheats+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 21468 bytes
SHA-256: a5e9a132113980b731b75d9ca2b304f9744c9daa7b650c4af114daa67fa705dc
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 10744 bytes
SHA-256: bf1d5ab2936a6a7f35bff3d4bc8f28bc890fd4c29b1a08b217721930b48acf85
font_03_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7