Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b15e6256a66510…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 13:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70cfb48f6cbd0787313cf5e256104eb7 SHA-1: 05780b2ee532befff936626ee560695124e4b575 SHA-256: c4b15e6256a66510d9110d1a20f26f8bfa1e4f8590643b73cc288f763c739e98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristics indicate the PDF is structured as a link farm, potentially to evade detection or to serve as a landing page for further attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=comprehensive+convention+on+international+terrorism+pdf PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2vdu5fkjm8jetk9e7oejivf73i/kepabofabukuviniwovajad.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/jijisuwasetaperodela.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142e8f69---dogegirixusobilo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kuzekaxoke.pdfIn PDF document text
    • http://saimiri.name/upload/file/7949337464.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1623772737785568510.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/kagonej.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/sapajaxeziladekobosowa.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/86200031557.pdfIn PDF document text
    • http://medica-brno.com/files/gemolojelibotidefalakidi.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/45953372070.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ec784ce5bda9cd1adb6b615590de6626/mifajabufugujegemitav.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/waweganikaxerisirikutid.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/89555089458.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cde7869e430db674a203e9ea87c1c1ce/buzejetakemokupomew.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/pka68jeaenqe3vutisrtrjfn6f/zapolufikeworunarapavepap.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/18264577872.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/vonemarajebovusiderojedi.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/kedidabumotelava.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5495cc540---pedafowepuseruk.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69865893426.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/91075341798.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/susibijoju.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vikir.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 18584 bytes
SHA-256: 874382d9704538029cac4351d382787bff2c55ba15425e152b2eccbd594820cb
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 10980 bytes
SHA-256: c690d01fb9e4fcaf2486f73e5223f35922efae5782521a853755a33a0b5be6ff

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