Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cbc99490509972…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 18:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bfcf9027b9f2630a83b568b6b6c1ac4 SHA-1: 686300b52d89d61e5262564b347b369a5840d038 SHA-256: 02cbc99490509972aebe7577dda2f14511b5d972e0fcee1e6b926de11eae127f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://777mto.com/contents/files/28927852967.pdf In PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dulup.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kubesutibufogiremajabe.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/40798228765.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/mavujewumat.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/xajatazatejarud.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/serivadabamunemisisezedir.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/42328290059.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/55244325105.pdfIn PDF document text
    • http://rvhifi.cz/files/file/46362025730.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tadulugobi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614256f7ef823---82165158616.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916051922.pdfIn PDF document text
    • http://mestan.by/images/file/71606773452.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/viwigibebeselugoxomekeko.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/bunezad.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2d98655aa35c97bd1d2f9fa3dd7e509d/rajitovepivasemanuxo.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/ruvubupemekun.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5o1v5anupi35pnp1mg328jt5l2/sebixuduzokezekod.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/kamewapefalupofuwu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/70804342659.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18159360878.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/rebawanumigodovimaburusub.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/12916537687.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/50570222093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cool+apps+for+phonePDF 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 18100 bytes
SHA-256: b95c6cafa40dd1570cc9f9baeafcfa2927e9b09b8945005e9e9e20d40d6726c2
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 10296 bytes
SHA-256: 1822292f676d7f88c8243a1f3b5f7dc8e3f04dde4f4094644263e126fea2dea3