Malicious PDF — malware analysis report

Static analysis result for SHA-256 89128fb0d5157e43…

MALICIOUS

PDF

116.0 KB Created: 2021-07-04 23:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8fcc86bb6811f90ed6dd3e17729cf81 SHA-1: 65fcb0d820fa372f08b17eb7a6b4094d98b1d6d7 SHA-256: 89128fb0d5157e433b47e56666f660f666485f85a3fd2b541dea22b57c3f81ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://absolutelyneon.com/userfiles/file/25536815565.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74fcc1f234---79907096606.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l4erhdbilmd441cq5ejum52af4/karagukuwa.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/77d0e4ece90f770b1babe1e303e1f354/gofebap.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/aptd8u5ee5r00j6gtqfeh37oeg/16289218421.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/39940238007.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5d474ac0675b40b07970d3dc33e37691/36500215855.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9eeeca90---sagojemixo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g1h36pc05cucfdk3ugvupqmtrh/33131227042.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eb1931f6a2583d4125da89f420890cb1/deroxasevesafo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/82125025314.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/miwipigoxuwixezikaren.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609febcb73d5e---11883488207.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c23545c46a668547092917695f84f7c9/zotixobefetu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/37116777253.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091437ca1c3d---18125847323.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/puxijugefijibawadamesal.pdfIn PDF document text
    • https://nadamasristorante.it/file/paxodap.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2a2cmhpd118a2fc3rcpd9phb0/96520835843.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/9468498224.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lutexabadolu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a87855662152f8fc8837927a840e979d/42858285804.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad000acc4---latejazesevakebosaluw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1c28f280---91618959421.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tupjdqjpsjici0j99uvo9797q1/rojivase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tricky+logic+questions+with+answersPDF 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_off000163dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DD 11012 bytes
SHA-256: 360ef620c91194040e8f651c4db41dc75df0d2a266727aa25197f527d7fcc752
font_01_sfnt_off00017d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19544 17204 bytes
SHA-256: c9b6bc06b9ca2a2059c1bad06fff04a2ac438f16105c4c59a3c09d3a6310a872