Malicious PDF — malware analysis report

Static analysis result for SHA-256 5210167232718353…

MALICIOUS

PDF

82.0 KB Created: 2021-06-26 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97247e8fc8f798a73569f3a26f617f54 SHA-1: e75a62860d88e9e2b6bbe12ad02e5b8417a9a60d SHA-256: 52101672327183534e95a6b5d719531010a30c7c3266092d2812e2d1cab977b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to compromised websites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=glass+sword+king%27s+cage
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6444420c80f9f22050d7347de40631f0/lejubamilumijiwe.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/267605fb5ab84827363d69b072df3a9d/89309620287.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/159d3723a3ec8d27e6429325018b8bb1/74837289076.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a9607b79---89031749871.pdf
    • http://aarogyamedico.com/userfiles/file/dekajesopamuwojerajat.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e3sgaofs49h9koqdv21h2q1fm3/goviludafabuporer.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ulpd4rvug7f9fhssqqap9468ep/82102804728.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608092d378d58---19576833119.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c51ca053f1288f3c0349e2bfdfb6b75/sodixugepefaxijobi.pdf
    • http://anbao.vn/uploads/userfiles/file/8945834581.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/mixoribosepedemuwixiv.pdf
    • http://jucal.es/images/file/6393374487.pdf
    • http://medica-brno.com/files/tomiga.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609700b059f55---70512909822.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1db4eeb7a545cf9ec409a917a5e7c954/44379041792.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1276c2b5---fusawiberusozasamudewaso.pdf
    • http://aelma.com/sites/default/userfiles/file/87872194791.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5276f72e7fd3905b170bf9612a82389f/nugowovuwixawuwewadit.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f2849ea4---74970582056.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ba62b60b---29276826783.pdf
    • https://mangonebike.com/uploads/file/sevutuga.pdf
    • http://apricomm.com/userData/board/file/dutulalavizujipubesizizi.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_off0000dd7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16792 bytes
font_01_sfnt_off0000f58c.bin
7181b77d77221b7246ae21cc9f10983edb73c6c9ca8084cb565f51b11b940873
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 17096 bytes
font_02_sfnt_off00012276.bin
c05af628437600c6ab8dd9f09eb4bdae8e69c077ee108ee30359d7a336a62e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 10696 bytes