Malicious PDF — malware analysis report

Static analysis result for SHA-256 12764aa6be141a8f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c3c61cb7476720f41ddd9fcfff9112 SHA-1: d9f5aa9a38a49909483fea9f4d2e427c4077162c SHA-256: 12764aa6be141a8f1de67b1efa39ac52a58aeec21b7fa6dffb68908f35965d66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pixomot.ru/uplcv?utm_term=launcher+for+tablet PDF link annotation
    • https://global-brand.net/userfiles/files/fuvovonosikenu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/zubuwubafuwifazesilagik.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/miwivadujemuwabotiz.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xired.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe50676c4---midibizaxifetufijuvogoz.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4aa0e0e5d310567539d04eb83ba1458b/47892878440.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/9139265648.pdfIn PDF document text
    • http://emaaravm.net/upload/files/17961190081.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/mafifolebizipaxisutab.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/31124309338.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982337247670.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/35577438956.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/muzopiligep.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32563912973.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/54340741424.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/37265024973.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puravaroranugipepanoro.pdfIn PDF document text
    • http://kant21.com/userData/board/file/63105946638.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/43218545526.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/89806140501.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/07541d653fb7ae55ebe2f70e52a739ce/48012983233.pdfIn PDF document text
    • http://budropol.de/Upload/file/11698923720.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/dukisibize.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kidunopi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 17424 bytes
SHA-256: 2c7420638e6a486642dbbdc56c14b5280f41630f48e6c492db00f65563044647
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 10368 bytes
SHA-256: eba3ed92674988c8af77c7ab2a73c10ab180853a65e0e399eb30ebd4a4cb00d0

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