Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8078d3cffcafc76…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23e042dadcedc51817b86954bc0850d6 SHA-1: 92e5e23a2d3146e110e6e7cda1fcfa68769fde29 SHA-256: a8078d3cffcafc761cef288c90ddee7e58af755a857c2b18ccf6e1ac27d53c3d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pkynfe.net/userfiles/file/mugasetolisexedikewuxabu.pdf In PDF document text
    • http://www.colormotion.cz/UserFiles/file/wubezidinobetiwixub.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5fb4d2aa---30809991767.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210813_A705AED40DAED1BD.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/puzamopukok.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/tepubazed.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf2e829a---jotuzosedali.pdfIn PDF document text
    • http://keramann.ru/uploads/files/73061404375.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kizajaniwazupupowak.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/legixedewakon.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/72067670840.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee301c621dc---79009790422.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/91637357726.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bonopid.pdfIn PDF document text
    • https://jobtiara.com/files/files/17693140261.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/46955943043.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2qpfg83esffu58h04vtpog3j2/9063970055.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/lolovivujanigijefof.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/nubumemenir.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/49517640723.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/56955934143.pdfIn PDF document text
    • http://domplus.su/userfiles/files/74137561366.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-10/20210810125037912285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chasing+martin+luther+king%27s+killerPDF 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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 14876 bytes
SHA-256: bec25f939d90a419f410c21bc6d5d0a8bca66d8690224101dc660fd2b17c6398
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10692 bytes
SHA-256: 542b46c56638be94076ec6acc70a80fce12a23ea129df346fd8591b0eef08e97
font_02_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1