Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edc82e1fba827b6…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 16:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9cbd3afebfbe31007a71758114db9fb SHA-1: 9234dff70c955c86956f05219476500c0956e52e SHA-256: 8edc82e1fba827b6204e46f9ff608433e1e569615b5b1c701e3266507b199246
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, each hosting another PDF. This behavior is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xanbiente.de/userfiles/file/mexukagotirimedafivi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160724cba93532---89558931387.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098993cba6dd---19327598632.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63b5cf1d1f5ae88ad4576de1306a5d20/88678888847.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i521cfq6vuvs9ctardh53vlun4/1227122672.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3ab8576a4317666e668f53a721234521/zuzakozuvumonuxikozowepun.pdf
    • http://belst.by/upload/file/bukidolon.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cf5a64fe4f14a8a5d4fe64e471ce8aef/gogugezutigulow.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3lmjd84jrh391n4htul23uaqkb/diwimazeteratatalub.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdebb1446d---rakomuba.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/02f9245c20318699e1bfad66b611d820/66118798172.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bogovopudakapoz.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7a1b3a69---ludolizugefufudi.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e1cac12638a2ceadea4739ab9db4062c/gudufojozuvuvonunagor.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4b22ace5---muxudobolora.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ba09b66c3a961673749ec3fa1d99e75a/dowomixudigovaw.pdf
    • https://prestinireedcorp.com/userfiles/files/vunuviponaxili.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88761f9c4---40562508067.pdf
    • http://15889163.com/ckupload/files/6958331429.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab7b5fe2---58712024280.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5acb9d01---sazemoxizafedagigedel.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/wulunuwifixuwikino.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxikajibirani.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f632iuucqngj4lme4sdids37ha/63653155134.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=multistage+centrifugal+pump+theory+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_off0000e9c4.bin
2fa805ea8e59f3943f0c4317c7aff9b54b139bfb6ea25c63055ca820fc0544f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 16664 bytes
font_01_sfnt_off000114d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 16792 bytes
font_02_sfnt_off00012ce7.bin
9f22980506d3710618992f8733b371e1aada4f0fd597944f6b73ad0a47484f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 11272 bytes