Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa3c6ee284da82…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 16:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad5d3b4c21ff44b2eb60044045323979 SHA-1: fed86ec3373da7f0d7af2ab503d7ce9a167404c1 SHA-256: f1fa3c6ee284da82c4c938182bb164e9f581f032c692927049e68e59c32a9176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lure users or distribute further malicious content. The presence of external URIs and link farms indicates a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://living-stone.lu/userfiles/files/84165227412.pdf In PDF document text
    • http://rutka.pl/media/upload/files/14e0e65dfa9f7a343daf371d8bdb758e.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/42622799286.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kofitum.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0c969e0c2ae7162df713eb694eaa989e/50308581323.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9b2b6894104b640cb97b608e4b364a72/82202989486.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/38424302730.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48f02b09a75afbd7900cde0f2856a35e/gorufekegan.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/xibur.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/13826484639.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/96834626612.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/24913948419.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/36098509088.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/13966794569.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/51353474609.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63493220399.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/68852279906.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/ruralunigorupuwanax.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/mudajebujabasamevunomapux.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/2134763921.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/43523666386.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d086676c7---pibal.pdfIn PDF document text
    • http://zenithmetals.com/files/xesodutakisubij.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/worewitorizodefekujam.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210905183515.pdfIn PDF document text
    • https://cooperspick.com/files/85852003449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=galaxy+invaders+alien+shooter+cheatsPDF 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_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 10788 bytes
SHA-256: 4f3a398d9ad699b16e07bb82a5da2784b2efb02511d58a7a8ba94c135d9d6cf4
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 17552 bytes
SHA-256: a887e61546134cd056ec8baec84a9e5073bcc2ba4815075b26d4bc03c2332e90

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