Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff64f6a319e10da…

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 08:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b00fbb97e55840bc0c24c34a1e68061 SHA-1: c36c3455e47761d69b5e3ee509c043c9f22110b7 SHA-256: 8ff64f6a319e10daa115df46f22ef96df813c95035cf5ec397f25c209fd0394e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and compromised hosting suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161163ada44dc8---jekuvitoga.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bd02e8273b---16033936397.pdf
    • http://medeeatour.ro/mm/file/84452891209.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/5939590089.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9be9dba5---85511074257.pdf
    • http://zrdb-drogbud.pl/Upload/file/gisunimijemizeromavasad.pdf
    • http://omonetach.pl/foto/ilustracje/file/73539474864.pdf
    • http://romangruszecki.com/uploaded/file/17021867773.pdf
    • http://asianmosaicnyc.com/userfiles/file/katowoxozebuzokutazo.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5635b8abd6d61ab4987947ae40fa7e7a/23741765224.pdf
    • http://eclickapps.in/userfiles/files/zusavemonatewo.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/firinavugaguwabes.pdf
    • http://geniuschulatutor.com/userfiles/files/97613452991.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c9c5b9326efa0749b7e4133262ad586a/8261903877.pdf
    • https://holocaustresearch.pl/nowy/photo/file/85473362477.pdf
    • https://nusantarabet4d1.com/contents//files/93328842880.pdf
    • http://www.pattyn360.com/upload/forum/files/67021700985.pdf
    • http://creative-format.com/upload/editor/files/nixilosoli.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=toilet+training+in+3+days+book
    • 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_off0000e6e4.bin
84622e3aa1dabf4dba439d820d0729d27ef939a889bb76053efe0bd8d8788d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 16560 bytes
font_01_sfnt_off000111d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 16792 bytes
font_02_sfnt_off000129e9.bin
6cfbc6e9e5545054f9d5d7ee128b813a4663f6a078767b07dafabe8ee8788eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 10904 bytes