Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b6c056396e18dc…

MALICIOUS

PDF

98.0 KB Created: 2021-09-12 18:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a9b997b39c08434fe2059b0521dd871 SHA-1: a83a80730d3c0ca329ac7af15d38b695c68a4260 SHA-256: 80b6c056396e18dcb2f5a89ed4ef06a5c9cbb847f0d3eb83ceeea7d746a8d349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i2fmobqv5kbils6krd6jubn2b1/jezesepugorepudini.pdf In PDF document text
    • http://61kidsclub.com/userfiles/file/52339534298.pdfIn PDF document text
    • https://85097781.com/upload/files/pujojofowijaleruwesir.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/36960310975.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/pefosumamaresupaboweguwu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/devevebofasebizuzuruj.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/samukasepimazafobuzazex.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64745236158.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kokawike.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/3968833235.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/30712340223.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/rixewupinetakexizil.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/69034324922.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8a23eb35---jeweparenalenupotidamu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/30248178063.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/81196719119.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac6b3ba34---digufisigu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/pasitipitamov.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908183156.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/23789639279.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/19337135808.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/74591960328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=divine+comedy+illustrated+by+botticelli+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_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 11200 bytes
SHA-256: d3a7cd5509b45e76fe1b7581eab21d80fe0727d25693a6a4a25943a3188c53fb
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 18844 bytes
SHA-256: 8f255919fe16a73790b7d6d04ac452b3769c49587cb46b15377e7b49602892ad
font_02_sfnt_off00016293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1