Malicious PDF — malware analysis report

Static analysis result for SHA-256 689fb36666359297…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 03:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ba860452f5a5dee1b8b0285704c5976 SHA-1: 4fbd799e581bfb5870c498984f0fa1a020075d49 SHA-256: 689fb3666635929713c85890613a0a25b0d3773b786f694ccb966ca31e906f89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download' lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://panoramabyty.cz/content/sipajigimugojot.pdf In PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908092228.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kexetefibukabogabatog.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/nodameziwif.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/gefururunojarefofufuzuje.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kikumomuvokibazirifafute.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/496030554.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/1148120775.pdfIn PDF document text
    • http://boldogelet.hu/media/37540076439.pdfIn PDF document text
    • http://weingut-suppan.at/files/26132760812.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/38824708152.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/gozolagor.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d9c602bb1f8ce86f2aa4bfb239c27124/91786850285.pdfIn PDF document text
    • http://cichanski.com/Upload/file/31655033267.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/027294f562d7ea8458185ff4759485ab/85785186914.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/22343266586.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/totorusujasabimozedarobi.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/kilabotajo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/66015033963.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/86729555837.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zawigavikifudepujov.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613952f67a6a8---lopijisajadodogevu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/51050614728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=assassin%27s+creed+odyssey+download+crackPDF 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 17228 bytes
SHA-256: 3110ce8125555b055678ac1ed7459010fd533b8663883df8e21c7de8df8d3750
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16636 bytes
SHA-256: 239720355e5fb0122471f003031698cf04477675ade55fbedfdfd1d34f9ebda9

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