Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e8db044bbd0b4a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-08 00:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d7151428268fba301179a3bf1159639 SHA-1: e82de292ded96d0e18c1426980b7e76efac40e7e SHA-256: f0e8db044bbd0b4ab37de886494941dd82241f7e8e681cd44265e0bd93770cac
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a851b605c08---5709171594.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/790cb956b40555035b5a0992d68cd397/gazito.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/92511793219.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75862b593---12200012496.pdf
    • https://a2designbg.com/userfiles/file/wobujim.pdf
    • https://stmarys-perthamboy.com/upload/File/68824113009.pdf
    • http://agarimo.com/archivos/archivos/74868923930.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5rchk7ilt97hjl8kr1vbmq56c1/45702656403.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f97790ffb3e60fde075d5ad7593e5c2/35320429724.pdf
    • https://coluer.ir/documents/file/josuzujewixudu.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/37752264489.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/suwufu.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be40cd21f2e---xemisuvo.pdf
    • http://villa-carlshorst.de/sites/default/files/file/78568034798.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa38bd85a---38746981529.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ee463928---44738698770.pdf
    • https://businessservicesuk.com/userfiles/file/80807775880.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a27010cdc72ec62d522fb486f85f78d/57471541254.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160801615099cb---74691703744.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mltr7dbcgqbe1l55261juc2ie0/58340764052.pdf
    • http://rghsalumni.com/clients/82979/File/kononetasawidubego.pdf
    • http://dentherapia.hu/files/file/segupasowinamituwona.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2l64evpcvfabjsejvsg0qiqce7/22614091790.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/83926210719.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58cc6a65c8---falumeta.pdf
    • https://vicotelecom.vn/static/source/images/file/23023186845.pdf
    • https://mintowncoffee.net/uploads/images/files/79486148958.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=maurice+river+township+school+district+employment
    • 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_off0000d7c7.bin
ff1db30a9a4978f44574d8d952a55195262ee88f6b0f8ba5346aed7a41fc48a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 16780 bytes
font_01_sfnt_off000103aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
font_02_sfnt_off00011bc1.bin
f59568aef0c915bbf36341dd1e5298d1c7d730b1e221a94ee32fb95c8f69076e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 11136 bytes