Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fcc15502181f70…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 20:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ff0add98b0a5f00e948421a2eba6029 SHA-1: 0c04f89fd2febabb12b5936bb69644402b1185c8 SHA-256: d3fcc15502181f70c90b148e758f9a6983dc66d2c8ce884e85146b4e8c544c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=mobile+offline+games PDF link annotation
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/53105221722.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/venosexanomimez.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/filarififowutamidenebikab.pdfIn PDF document text
    • http://szm.hu/userfiles/file/20106320077.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/meruzel.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/14618158337.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/jusabusepesoxujevita.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613070b70fd41---24287285054.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///2618620306.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ralupaza.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/safuwabedodidelos.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cgop4221vp2p93cpn2u82id43j/tosezek.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/227ff77913044827e6380dbe871a6503/lipomumabatib.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fojik.pdfIn PDF document text
    • https://ayurmitra.com/files/file/fesunose.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gixolepodenuwesot.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/33720152402.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/janujosetetu.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/levenave.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wapozagagotanarobavafux.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/71042755097.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/i47si5tqcqallsdo5reerpr2ah/badarefutujuv.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23210534656.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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 17528 bytes
SHA-256: 9927ea2d3d35522641892809d39fb633d3a175e47afd5e522461010f953dceaa
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 10492 bytes
SHA-256: c7c4f3a1cfcc45ba41148bcd17d3bb6d0456565fe7d9762f52a51884fe99b74c
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1