Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e232efe38afb451…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 03:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3294cb4af60affbaf0c5b113eff3f21 SHA-1: e7c12d0424a5d9de9bd98953a5681bc76f9c6867 SHA-256: 5e232efe38afb451985ffca48b27d9e859dc71640333006921b091662d6cf140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://askisan.com/upload/ckfinder/files/vetitovodubimix.pdf
    • https://mn-lawfirm.com/box/userfiles/file/74190027029.pdf
    • https://luminex.pl/upload/file/30288026935.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/82301990452.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f8ee94ef---62619958695.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a054cf1d46d---vujusoxifinigexefap.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e27d3cfcb921a37bc7057776767e1e22/ropanuvozumapip.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc7db7824---laxomegewipowijezeliborof.pdf
    • http://propellerclubsandiego.org/uploads/files/tubekuxabijuka.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/38336628848.pdf
    • http://kopdesign.nl/userfiles/file/dozegipab.pdf
    • http://paliukenas.lt/i/File/vumerikivokogalevovexuro.pdf
    • http://beateromer.com/bilder/file/jodikerokaw.pdf
    • http://collegium-connect.nl/ckupload/files/wikebofuloxogidusuket.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/85875370531.pdf
    • https://mama-light.net/business_school/uploads/file/jubodusolotiwuxuwudi.pdf
    • http://extintoresorigen.com/images/editor/56109628059.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a09aeb5036d---lajudakunaje.pdf
    • http://valaptop.com/ImagesVA/file/86367263068.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/11826232654.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc3503a26---54640918773.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=intentional+interference+with+contract
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed89.bin
2e9795596c1b532d8e520c8cf3c2380da47cdbe244231cf5bf27aab23634c646
pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10300 bytes
font_01_sfnt_off000104ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
font_02_sfnt_off00011ccc.bin
9e8bf203d18cc4053a66ac9374c9fac077225b8d43f6fa4116f05a960c47f046
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 17192 bytes