Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e64c6480e7e0293…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 598242b50deb58f1bd2a563ee5b9ce0d SHA-1: c8315bf3210be92fd2ee6f34078858e973ba7b4e SHA-256: 9e64c6480e7e0293797a5dd6ebf5c8af4aa4b0a566750f3064ccda1e8f0bc918
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link to a compromised WordPress upload directory is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aneri12.eu/res/file/mabijabejunizizudagip.pdf
    • http://chupanhnoithat.vn/upload/files/74618715184.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/84331461307.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3qteesutj2je1aaq9tll8e83pd/64364676991.pdf
    • http://skomi.ru/img/files/file/96572830919.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gid6g0kqruddetck9cg9dk9kl1/wumewekolimedag.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0l8hcj1h98vm0i2h781j4osvm7/43861525657.pdf
    • http://caphegiabao.com/upload/fck/file/wukutomajexamedipod.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lkhn1alcshusjpod2biertcl44/15123504229.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716390e3f71---bokuzogirerusi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe3b1cafc---tisapisuremo.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b699e3f148c---40599199333.pdf
    • http://rolmech-strzelno.pl/Upload/file/vuvifuvuxogixejobuse.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3onvpg9sskbtlu3fouggnajuc0/51906768116.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8184d6c8a3---54858845703.pdf
    • http://normel.org/files/upload/file/fixitamigefate.pdf
    • http://artospace.com/pics/file/11745291774.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16085d340710c3---kobokajedixideketojitiked.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/40665850819.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3282cd97e0ee1688a439f99e2db0e13/27238433294.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/be5trm4evmuoojoojtsl5ruopg/jakoma.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/53aa19fde25d8fda5aeb6217a793a587/sumuwefopibiniwimo.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7f02810e7107a927c58b5857b7247eae/73397125882.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bfa6febf8f5267425f255fb668cbe0ba/dereseka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=excess+of+loss+policy
    • 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_off0000e107.bin
e9c090f1da6f6cf34e7882638ddb80232f23ab903f8ebb78acc46ec72953d97a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 10208 bytes
font_01_sfnt_off0000f812.bin
1f2cb8d81facb6bf0cb8e49020385fd6addca987ce8af67bbc565040e91d81ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 19260 bytes
font_02_sfnt_off00012984.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 16792 bytes