Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2e868d3de25594…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6524269ef1026aa13fa45cf0012ae601 SHA-1: 0e095145dcde0468a75987f75d784664477f820c SHA-256: 8a2e868d3de25594977867c46d6c7285d3eb96693a3c89c9376cfacfe5609e4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=samsung+note+download+apk PDF link annotation
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tenonerasumo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7j57l3edanivh650ffdath0lo5/xojivupezomug.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/7005484250.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/evosjf7gb9s1qjs4gc1oa1q2ud/87690923078.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/25815752440.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/93966790618.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/xemefarotisoti.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jujafo.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/3784825218.pdfIn PDF document text
    • https://eklyps.net/images/file/lopokezu.pdfIn PDF document text
    • http://oilspecchem.com/files/wotuxuvenobafabu.pdfIn PDF document text
    • https://biodez.lt/i/File/522694204.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bipumomutupuzubon.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/guwuzazilu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j4qfi4b3ubhie1enj4dh2upp87/vezasufalerefi.pdfIn PDF document text
    • https://irrisyst.eu/files/file/7295133377.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161440ac482677---gonuvedabizikilore.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/14873155179.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lajukutuzuzufo.pdfIn PDF document text
    • http://vhshf.de/File/73892239449.pdfIn PDF document text
    • https://cargobull.cz/res/file/bulajegog.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_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10896 bytes
SHA-256: 3087910946ecad5cb113f8ba4052d4711f5fdc12dc14e3640381b7e554eea731
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 20076 bytes
SHA-256: 050ae05c03e59b76ae1bc8a2f90758c392cb44eabe0f4590c1e511c387cb14b7