Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c1ee2044b19424…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 21:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 309e6f4c74e8dfacbb5acc0a79983306 SHA-1: 4b9d0b670fc9e609b791234f1f7396b81abaffd8 SHA-256: c5c1ee2044b19424fea1f0dc813c8a3ec9574ad0a499b602f1066d7c577604ba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=pubg+lite+apk+mod+unlimited+money PDF link annotation
    • https://nslogisticservice.com/userfiles/files/jitubewawegakarobikima.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/74529942410.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/6454402369.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/28342059410.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/48176902075.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/podarovini.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/47306839285.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/69641083145.pdfIn PDF document text
    • http://haki.vn/uploads/files/tifafigopugewu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5433c900---desugokuduguvazofegafuwex.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/6801542819.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/29474067744.pdfIn PDF document text
    • http://live-net.it/file/poxopotigarixuziral.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/fojomunonuzozol.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/tuxaboserepagodade.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/waviveku.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tuxelinigoxovokuvowoke.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d11aceb6---bevegerogetitunoripujab.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/82623514631.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bd843401---gevofalijagesezufewotigi.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/71121235819.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n8jdmep9fh1712mrmnkq5uakst/rumadub.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/jemazoverabalerijojuxaze.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In 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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 17872 bytes
SHA-256: 1f16f34e0554f61754d5d089a1d5cee7614c319abedfd8c5108f54b8bb1b19f1
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10916 bytes
SHA-256: 56e9a4e5cf3a000bfe49b286959c48217f21344ea97d2b55187403d6c940711f