Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa01cf0bf245701…

MALICIOUS

PDF

124.1 KB Created: 2021-07-16 03:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68b55a7bd8f053f99d703d95d0477aaa SHA-1: 2476c4c11c613ad525054e42f6c4feb4b02eddfd SHA-256: daa01cf0bf245701064b5efb275c98f3c598f92519beb21908c3e7e26f270c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/617ad29b2bf01318d145592da6a25abb/96583407587.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071677ade206---12928787571.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63f0e1a97---66989311113.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3caf177ccd---39635978796.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/kaxod.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c7bc0fd2---begegulut.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c35eaf0c---tozizo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991689553c6---97285340645.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b04991fe9---17438990439.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/wapevonexeximufujip.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dadonet.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/79609976968.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fenasub.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5ef1a144---18322054043.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ejgfonmb9g5kqebgd3uunhf7i7/kojofaposuwalixosujemujav.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9489c75dbcda1eaacc68071b9c1fb53d/876128802.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd72e0e2f9f---zananebuja.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/67307209831.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16078feb673fd3---fuxemexuwogalefibijavo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/316739ccdd8205b1ff445dfd7475bf1a/zupetawupenabovolona.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a192586863d---57645809418.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/70823869728.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b3683b3c7d4d6d28ec967e4fcb27ab5d/22752200291.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fd8299b2f92132addfebe4b448c688cf/benumiladepijufaxeta.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/naxip.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/44e769e43a5173cd5b7b091254c3f42b/xuposolumi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/26c2e842a3d52aab2671db38542208ce/deroluku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+far+can+ducks+fly+in+a+dayPDF 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_off00018003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18003 10620 bytes
SHA-256: 6bf63151e67bbbf23cb1dc6055d3534056fea1d7dcd58f82af3f77e07baa9296
font_01_sfnt_off00019868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19868 18868 bytes
SHA-256: 405d9ec4b39eebe18ba68ca19cabb985dc04bb1c43b8bd81bd30faecd7680cc0
font_02_sfnt_off0001c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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