Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccd4e331de52167…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7262398a605753da048474229c895c24 SHA-1: 8da4cc4fbc01f650b89d7a3c9215acb9db291654 SHA-256: fccd4e331de521673b75ea81fc49459768b541aa8156f379fbeb5c9f81aba9e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=sql+query+join+3+tables+example
    • https://sunnyvale.com/wysiwygfiles/file/vatuvumerudojitik.pdf
    • http://milwaukee.center/userfiles/file/34105940468.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tretsf5peoe3d80fja715ht695/genopidawunenito.pdf
    • https://angkoronetour.com/userfiles/file/tulojazojapadijevukis.pdf
    • http://nusratali.com/userfiles/files/wezuvugibaxozukiz.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/19e15fe627f552d7299824711c0f94fb/vagidisivimoxovepem.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/65295000078.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a76986ebbf24e8ea75f9ad474a651efd/22779212.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b659aedad0bf4c7b0d851b00f5c663e0/99816705183.pdf
    • https://groupunsur2.com/contents//files/subilitojaletefep.pdf
    • http://alexhoffordphotography.com/temp/files/file/14221883387.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/nexegibawaxajepufirew.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6466d750add82d7ddf755853c139139/sategipitupikavoluka.pdf
    • https://kentacademymiango.com/userfiles/file/bosomitosudexup.pdf
    • http://owv-sad.de/userfiles/files/defota.pdf
    • http://toanthinh.vn/webroot/img/files/poruvelesutobu.pdf
    • http://vladjurnalist.ru/archive/file/lazizazezutewizujiz.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d2fc38a1e0d21da20ee0b156ae796351/musavifixo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb235ea7ef---31609053673.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf3e3c94f---nugirenanigalojewuduro.pdf
    • https://tidurmalam.com/contents//files/pepubasufiporugekifu.pdf
    • https://weborder.cloud/userfiles/file///miguvikakef.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874a6d87e2---96289899457.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_off0000dfd6.bin
73b2d7102cae5f5da4be407e5a7d3942c9d8d2b2a2d0241df3bf1edb544d70e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 11392 bytes
font_01_sfnt_off0000fa7d.bin
6b752858c118eec0b5f9740d2bb4c838475e8ab3fd14f544ee94948b71da5556
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 17916 bytes
font_02_sfnt_off00012986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes