Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d62bbc842b761cf…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 07:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d00fd818735b6bbdc1d210af8dacddb SHA-1: 81f94f5b37b8d55de06e1404f091c1ac93571359 SHA-256: 9d62bbc842b761cf1f4f6f2fc29444345303178c07dad64e54a233c52c918ae8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of multiple suspicious URLs strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://inwebjor.ru/uplcv?utm_term=motionleap+photo+animator+by+lightricks PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/45173d3efa9a77653e0f80ccccca3837/11738584318.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f47d85da6df1a561d0880dba59c66938/lapemeraroj.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/duviposidaserunukukal.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138555b231bd---61887118925.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bomaxavatexomogum.pdfIn PDF document text
    • http://dsfly.com/uploads/files/75471194397.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/9416901227.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/20855712595.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/73784624428.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090106261673499.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kenurenebowupenap.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nururesemigebozaka.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/bosonogevajat.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/50615885862.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/pesopi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/laliler.pdfIn PDF document text
    • https://jensbrode.de/files/file/5877887098.pdfIn PDF document text
    • http://a-pluset.com/userfiles/51839756324.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/gopukegibapuwogema.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/30407558758.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3af26aca9769a5adaa98888da34a454/fisarakakute.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/gadem.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_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 18188 bytes
SHA-256: 1b5adf672d96b01effd2120854404ac32127e651e13b4c176fc1d4dbfdb842c0
font_01_sfnt_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 11160 bytes
SHA-256: 0f83c4c668b1c7a4b9d98a8d183f24e534eccd08a57335f3aa5cd64e48798308
font_02_sfnt_off000156e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1