Malicious PDF — malware analysis report

Static analysis result for SHA-256 950de0f932b465f0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 12:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3fba6d5aeee1631e3d3f6e2f730b0d2 SHA-1: d3384b540ad06b097877a6a9a273d869bf1f9544 SHA-256: 950de0f932b465f0f72faff622a5e06697d4ae98e7438f9478722ca49e57497c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading a password-protected archive. The document body is unreadable, but the heuristics strongly suggest a social engineering lure for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://intelekt.biz/uploads/pages/files/fegamak.pdf In PDF document text
    • http://vietdubai.com/userfiles/file/jakorifewisafotaki.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171b73cdc0---tonomiga.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifojidoxavumowux.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/nenef.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fagamevanifore.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/31559258710.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/21653384666.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/94360572213.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pipovuzobakan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f70ca6d20---35696782185.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/lufejap.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/tilirugubofimifiv.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/womamefemisixof.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dunasexapatelidos.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8b6f1ecf---vumigivunakekifalufesaves.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210909161144.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134070d8bf36---lawowubuwavisavadegurek.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161381e05c77fd---41180173101.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e14260233---16393047190.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/vakub.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/sopimo.pdfIn PDF document text
    • http://119pump.net/d/files/gowaxijukep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+upgrade+phone+ramPDF 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_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 15308 bytes
SHA-256: 4690c04bdaf1fa3040d98ddf4006fd0a7bb8c0dffc4318baf7f6c620f4b14b34
font_01_sfnt_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10712 bytes
SHA-256: ea0afe8b783f3a5c29efa07cd2daef1545ce40791e431610e9ca7c4ed5b95034