Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6db0b6fd7f3dabc…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 10:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6dc13e56746fdecfcb148e49f20733f SHA-1: b1f1787815e7640a133d0e64151ce9246a1206f2 SHA-256: d6db0b6fd7f3dabce14d6452154546125de97dfff9afeaf219459d29835f4234
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lure users to malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=android+18+wedgie PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/al3ukepfa37ggl0kefloe5q2jq/tidukesaw.pdfIn PDF document text
    • https://udruga-invalida.hr/files/daderojetogojevegu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/petabasewesotaveri.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358127cf0cb---65346696743.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/bupivajuwogopajeru.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/83icv1jnh1915firrh4rlau410/wijedopo.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/wuvijofemimidivitujip.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/49414341796.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///52583572549.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/losujuxuterurasolane.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/68541433268.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/bubefigemiveloxumupedop.pdfIn PDF document text
    • http://360global.ca/userfiles/file/61132906946.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/56933824439.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/rewulutasud.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/36918587063.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/52073061071.pdfIn PDF document text
    • https://airxps.com/userfiles/files/7019653484.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/47719526476.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8fcd3b1a---48833785040.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/66583012848.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/genibabemu.pdfIn PDF document text
    • http://p-energo.ru/content/file/27634316808.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_off0000c45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 17252 bytes
SHA-256: 36161b7febf2f5edc93e063e65706c5a6e813961c3389717f63d41e3f84af949
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10276 bytes
SHA-256: f00b1016b406a0efd26733688fe00db6e36cd827eed7a2e4f10a9957e46aea79