Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce538a9a7e30649…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 16:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c99ff1a180c34642be0e70c09d6e922 SHA-1: 49c5a6021b562f4af61024b7974166f5a78600a1 SHA-256: 6ce538a9a7e306491ac62ca34d748d2adeb402d04bc71c0dea2cf4bf3a3b112e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drosamahetta.com/userfiles/file/magikip.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612FBEF73DE88.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/27902638403.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/27522343390.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_091626.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e59d057a75b799dedf9efde5764aa865/risugugimobi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l3e8o3jgmaf1mf59oskmlnmhrk/41318312957.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/rezosovu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/9729578770.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/17649021016.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/22824856083.pdfIn PDF document text
    • http://bienbao.net/uploads/files/41531638186.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219121747151350.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c22b6975cdaa20553b01ffda82f62954/44297003883.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bccc2a3f---retebuludetewaxutek.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/13723051147.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/majuxifevaxisi.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fuvovewetixufabinelekoza.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/jutiziriko.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/59195584910.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/55747359485.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131643e5be5a.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161399918f0962---bufewerovajaku.pdfIn PDF document text
    • http://freestyler.cz/img/file/49939383635.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd3cbb4f---20035628736.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bypass+activation+screen+without+sim+card+androidPDF link annotation
    • http://www.fotolia.comIn 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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 11152 bytes
SHA-256: 549a28f9e007c55039a4271715d88f4cbc2e123120061ccaf20cda08f7c5dd90
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 17756 bytes
SHA-256: c92b6e44954932dd7e15a52c90feb716c3efc9125500933c0ad371927e682334
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1