Malicious PDF — malware analysis report

Static analysis result for SHA-256 7615b8c506708984…

MALICIOUS

PDF

93.0 KB Created: 2021-08-18 12:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e96f3d9299e160b5a29a05856b2b8cd SHA-1: bd1b2f007e99b82f1688b7789e49c2d9141ac785 SHA-256: 7615b8c5067089848fe67e7768d93f4d445948ced58b5b255bf174adfd22943f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f5hjjue6peok3h7lk16a65kvs5/molekonoj.pdf In PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e401cdee91---vuzizomud.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50051649149.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e534e3276e8---8966038492.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611834fc21393---24534311913.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/vusukowamovutudi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lesidatinofexinivaladowuf.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/nolawapu.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/81370104056.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/jerazuvomonadabobomame.pdfIn PDF document text
    • http://strandedtattoo.net/file/piwenedeporixelojuwu.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/76042626256.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jufalu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9138468b276be7c543e98ad497216fdc/davivapuviv.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/597ebelot4qoioiinq9d8bofu2/vubuzitigulaga.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/dememezadilupapibof.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5b8e9771684a82df359e3a7a0e5fd7e2/44881750676.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f21253fc764083956f39c47b77057c97/1045860746.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f78cf67ea3---78920367077.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/42636885539.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uchda8uvqaub8nm3b4lc26eq9v/daditiwabolux.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fub692g5mj2k93i4876qb85p7f/tanotujazaxazalejiloz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/745fpur1d2h6rrrfb74qtomph2/lelapolor.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a7602d74---fupudowazogovure.pdfIn PDF document text
    • http://roocenter.ru/upload/file/30147464540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=principais+verbos+em+ingles+no+presente+passado+e+futuro+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_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 11268 bytes
SHA-256: fa19e40307a437eb76929593db665a80c715d24f17ad60b288cca6fd51283ef1
font_01_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 20396 bytes
SHA-256: d5b29946ed4b0206811c0de3cb830232f27570d3c166894091b7e02b5388bc35
font_02_sfnt_off00014b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1