Malicious PDF — malware analysis report

Static analysis result for SHA-256 92688d3a542535c4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 23:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e89cf0028b127f9897542657dbc4f597 SHA-1: eee48e8f4fb98f41b435092f5df612d64a718d69 SHA-256: 92688d3a542535c46b671c522b32468c9f59e4638c3ad27f3cb497d50c9159c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure designed to attract search engine traffic, likely to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely involving exploitation and the delivery of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=application+of+uncertainty+principle+pdf PDF link annotation
    • http://polaryachts.com/res/wysiwyg/file/23766210628.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb8650692---71797708503.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/32134529737.pdfIn PDF document text
    • http://malifer.hu/upload/file/97444593134.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/13717254833.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nexoxepof.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c5b9715c72806c8f9565beae806f6d67/87401261895.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/87374619223.pdfIn PDF document text
    • https://soechi.net/userfiles/file/likepez.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/1142275932.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/44383238351.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/59915441778.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bfea8974---78042221295.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b7666895ac03cf1d839db468345d883d/6843983564.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/xiluzexuw.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/sefovofalal.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bf241558---rofifipufusavudobu.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/25743406573.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/57295510921.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/oudvp76d552rt3gm5491v8g439/kewodijarukuk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affecabc31---15781243005.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ae389585---jazonenolugikaparugim.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/remesoma.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/79238612880a8596f31782b540860be4/dolevikuxaz.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10640 bytes
SHA-256: f70b9fbb1a167e99010703692913c27ef1e7d9a376912f236479b11c7212b701
font_02_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17616 bytes
SHA-256: 8dfe9ce6f1c4ec1c543bfbb90dded86dc41da04b3a5c06a2cce761d71a9fb763

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