Malicious PDF — malware analysis report

Static analysis result for SHA-256 3167b6d54ef3bd6d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 00:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b044ef4d35695c11184e16d510dc6c1 SHA-1: ccdbef5d848a28c26969f9e92a28636eadb71f0d SHA-256: 3167b6d54ef3bd6db54419c9d4cb4e8106efd19d46fcab1fd5a1f7aebb088e7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=funny+i+love+you+quotes+for+her PDF link annotation
    • http://hingliltd.com/userfiles/siferapotivavigejog.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c2366322---limamataxixitozebadipafa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eff63036ab48f455ef6fdf1e9ef8506b/xugobipufi.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/nawer.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xozeveguzav.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xepoj.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/48016929387.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wamixazadilukufiwijel.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/84780348450.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5782c97ce35adb168d93c7cd3e681fb7/66494114321.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/fupujisuvekijumolewajil.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gufamek.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/banit.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/35479760143.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/61699729228.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/51475734689.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/48172398151.pdfIn PDF document text
    • http://berbun.com/user_img/file/69068232462.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zosagevasupuzurox.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/visotavo.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/susijemakafo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/viviwo.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_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10552 bytes
SHA-256: d308e82e8f8515209ae53a433f62dc6499410da6a8ab50ccbe1e69df60a2756e
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 18876 bytes
SHA-256: 059e9c47b5966cffbdfe843526880bc52c594e1d5c07902a710297947d83df00