Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec60cf199d4f54b6…

MALICIOUS

PDF

74.1 KB Created: 2021-08-28 02:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4159cbba3fc68543ce0b53826ad0eca SHA-1: 39182278eefb89fc7a408c4653240463decb20fb SHA-256: ec60cf199d4f54b67daf37b6381aa05183723bc3e3e729b1d030610af58b3c5a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. This suggests the document is being used as a link farm, likely for SEO manipulation or to distribute malicious payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=linex+icon+pack+free+download PDF link annotation
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5100e6c34e09d6d22c1e353b446f51d1/51725518954.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d9fa66993---xewunibovogu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/mufidina.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfaa958d9f---43284193511.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sotirufanitej.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e15fa9528120983fd1852db013b0d333/dikilej.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9f83fda2---32334702333.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/30003538628.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/53802786914.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/9587120460.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jejupebileje.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b9ed79ed0b9cccf5ad2f7eabd97ff87c/vanuviwinatoregoluwe.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/81165863397.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/wonuvugidemovumuko.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/75469466736.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54421bd5df4052d05f96e541270867f8/somifise.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/samoruto.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/bn1pb8otid5o11j2fhndij53d5/78389920955.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4ifbv6liogm7p2audi2428j61h/62088092432.pdfIn PDF document text
    • https://numberonerevolution.it/file/ronosuraw.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/73950999802.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wanokizexefaxose.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/571e6b7bcd4257f8d5beeb4981134fcc/zevisuvewevola.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/149493411.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hppae1vrfsltt2trd72gr5fnl2/43333299217.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_off0000bdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC0 16588 bytes
SHA-256: 990224050a821bf08616ba5e853da77854b70dc71f3c51813929fe053bbdf3e9
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10584 bytes
SHA-256: f001101a54b88408840b17c3385b21942eafd32299df23b94ad0971d261c7c53