Malicious PDF — malware analysis report

Static analysis result for SHA-256 69913ab5fa472918…

MALICIOUS

PDF

93.1 KB Created: 2021-09-03 23:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0933aa70f29850b586ad289e2853359 SHA-1: 55151884277c7e0e56d4810ba13eb93acd4a482d SHA-256: 69913ab5fa4729188864113144e6f1e88b743ef588f6e56421d59d5d8c03658e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sake2metustin.com/uploads/files/35653791689.pdf In PDF document text
    • http://s2group.pl/userfiles/file/59824815136.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbae42a6---26965921406.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/75884225394.pdfIn PDF document text
    • http://co-mit.com/uploads/files/85107618071.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a1bbe1279008ef6d82171d5b393ae47d/jazodapizusedufakarom.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e05eecf0b6cb8226e4c499c55acf7c3e/jeduzuxefegatesus.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5796181087---viwowifirepeluzekarivubow.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/luvunuwumasonabi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/l6c56vkjrulfg7rb93jq1e1cfo/19508984499.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/vidiviref.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/duiaj2i59dc03nnikhn08rff86/japujifasojudematosozeki.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021071709273673499.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/4256438124.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/pasipil.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98790111370.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ac27a58e---wazex.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/dazoguzutufizu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/tebemujopipakijus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd36857e---tanemupet.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/73191611592.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/28843615322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=c%23+pdfsharp+save+pdfPDF link annotation
    • 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_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 24472 bytes
SHA-256: f5599530335201d8e84fc3ad7dced029a297582c9518912d743881fbb90302b5
font_02_sfnt_off00014f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1