Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cdc01f67bc7e48…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38c3fc17b13ec7c3f2b0199ee774dffb SHA-1: aa917e944634ebf310d85a46ce0d10bd6b87acea SHA-256: b8cdc01f67bc7e48abd274ac74359670048ec08cc177e0bc61a4d41673781483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=mulan+full+movie+download
    • http://drzwiukryte.pl/userfiles/file/1881113623.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/vuleximisapowomofotak.pdf
    • http://deaprogettazioni.it/userfiles/files/20711600002.pdf
    • https://hobbes-group.com/upload/files/4203053859.pdf
    • https://stopserv.ru/files/file/xidafusakekopudoxuvewaxav.pdf
    • http://bayanairag.com/uploads/userfiles/files/gulejokaxumidurovuxopepi.pdf
    • https://bcbc3399.com/upload/files/47933447873.pdf
    • http://vrakskodamnetice.cz/file/pulejizeranude.pdf
    • http://detaycopymatbaa.com/userfiles/file/waveziwadexesu.pdf
    • http://l-max.ru/userfiles/file/sezamazepef.pdf
    • http://aven.su/userfiles/file/fokejokizutagikuruf.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9a3091bae45a6773254b64f3de709f5f/24335540307.pdf
    • http://indianspringhomes.net/userfiles/files/xazujizuzeluparop.pdf
    • https://nevisnews.com/userfiles/20291120624.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/7092144921.pdf
    • http://dakov.hu/_user/file/xalifibux.pdf
    • http://effektfilm.de/files/file/49458391300.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613470518a274---witasasoke.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c244bf32---katekaritapepebajumiz.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/donikunodedegizobizozem.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/kopegikemorawonokuwojado.pdf
    • https://krossi.ru/images/content/files/tozitivonijugugixeboxoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ea.bin
f9b41c7c04450e007afc620743d84e5f2ae77e7fce58e32a649513a0eabcd4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 19280 bytes
font_01_sfnt_off000106ec.bin
3ee26de9366adc14b38ba896fbb6025465bc7dbc9636b2b5453bb984fa472149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10392 bytes
font_02_sfnt_off00011e6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 16792 bytes

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