Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3719f0c8eea96aa…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 20:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f844e13c5428431671dae0ab7b6110d8 SHA-1: 6317cfa9b7b8855ec5ac80922c3089c208162c34 SHA-256: f3719f0c8eea96aa3ba0e82f2c0317100ab67d54f60575a8b294f1d450f13ad9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. This pattern is commonly used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=muklawa+full+movie PDF link annotation
    • http://dalieuht.com/app/webroot/uploads/files/18853202960.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3db57a6c---1220146976.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/31084275805.pdfIn PDF document text
    • http://apart1day.ru/file/fujewirubovexukevujek.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a8bc383---vumuwijajotiluwabujigijuw.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2305688457e003cd8e6368493897f134/matubebowedanasen.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kudedafofafowilimobuxoni.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/ramawe.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/44654438932.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/motozelanok.pdfIn PDF document text
    • http://dgjst.com/upfile/file/35665195061.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jebobobixusepaxaz.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/zapufesafulatonopurisam.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/wajibaselumajowaveras.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/vakodex.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/76185975721.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f739279d3---60251700997.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73ca68d5---10003391683.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/052a586e8c65abae963b2603d5a7bf0a/lubowubuwud.pdfIn PDF document text
    • http://ministerium.pt/files/96769714911.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17420 bytes
SHA-256: 42c5afe051b9ce82c4be0f4feac11172c6008fafdc1c2858dfaa3f97ab040430
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 10244 bytes
SHA-256: 4de8d0f4bc8d2bacc071e5fd37ed0f2cc596b3904ded6692257371ad5e5e7bb3
font_02_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1