Malicious PDF — malware analysis report

Static analysis result for SHA-256 21362ceb1a82dc1b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 21:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 512c75aaad1ad0c00218d8bccfe780f2 SHA-1: 01de4dd56154852eb9552aa2443c235c78ed052d SHA-256: 21362ceb1a82dc1b92e8d0708492f07cff99ca440711008b6b13cbe0d97d34d9
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links to potentially compromised websites and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The presence of a 'download button' lure further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=grey%27s+anatomy+pdf+download PDF link annotation
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907150503.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/moxituzelibetiv.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wesijixabaxizerojat.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/tedure.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/polisarakewi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bffa0031---bifizuziregedipis.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/nuliwarake.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xipapaxugikepawo.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/rerefumepidowus.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/50903260538.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/familujetotosidufunef.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d2eccfb9---gokafi.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_084657.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/niwozelusevizawewoguteve.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/noweku.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fatelivonazil.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/4519825591.pdfIn PDF document text
    • https://uudanbury.life/files/file/tulaxowusofilebasililod.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/40567831130.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/dazurexituf.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55b90e136---5567954667.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/dexemagixitimazuruxexejaw.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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 17168 bytes
SHA-256: 5943de913c88b0f111ec96d6ecef377a20cebd4a96007448c74425d3b13f5c58
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 10840 bytes
SHA-256: d845d18371ed67c0a1a6183611df10881be1f1db06199374571affa8b291c76b

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