Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d82a2b5045b3525…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 14:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00aabc9ce9fea95a6118bd47a422e90f SHA-1: 91b865b8e80894b9f2fb52ff2de98f4fccc154aa SHA-256: 5d82a2b5045b3525695880010149b97638f6c4117ee5855d4437fb0472ce8973
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML_NYX_PDF_MALICIOUS heuristic with a score of 0.997769 strongly supports the malicious classification.

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://fuzoku-kyujin.jp/ckfinder/userfiles/files/67101286069.pdf In PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10178414579.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/35889494908.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/podarovini.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/mimozogilik.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c6f4b66dbfcf721798dc4a885417f81/1084842898.pdfIn PDF document text
    • https://limsurempat.com/contents/files/vujesojozowibubovo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/rizovawatixuputulajupiv.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d498238a---vogofofovazezutomarikezit.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/75263969106.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/nivususidejunazutu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/96321073244.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a85ca7c60030501612661842ac0570b5/vikozop.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/65707390423.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/jobadan.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/binenovinupoxesi.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/59357275894.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/18019162058.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/xipibexet.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/96646481551.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/wolidenokukerud.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/76732344074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+draw+hulkPDF 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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 10116 bytes
SHA-256: 50063f96ddddc2f77a032800d25e009f958e9366c811095041fb489f09cf9e9b
font_02_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 15872 bytes
SHA-256: 096a712057daf0a6aa5fb994f381a8bf7d4a19c652a0670a54a2bd917d5f7f9c