Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3216699ba3e49a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 22:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59171965bd8b46f044e4e0ab2ef57e05 SHA-1: 29860db9194f43f560ab07fcbce3818fde94ec0e SHA-256: 4d3216699ba3e49a520c1a12fd31348ad8f7d6d9f4d56050c36e274338048483
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=android+file+transfer+windows+app PDF link annotation
    • https://www.lipca.com/ckfinder/userfiles/files/gemofubiruvu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d79cb92bf327a83a585b620401fc137a/kovafisadipozofin.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/17/zagofolaxawuwivijogugir.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/xuxipexozoz.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/86823522108.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/mibanozegiwusinuj.pdfIn PDF document text
    • http://www.polni.si/Images/files/57927891283.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vunarewaxubavidum.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4e7dcc47cbf468585427ba042c8d4966/pasapagefasoripajenu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81a7c59da---75682463344.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/1102156356.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/82860729138.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/65382070707.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/40687480326.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vudasowu.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/57098010350.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614336c7d89f2---mefoxafakeresifopa.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210901_9C4B1421071E4A70.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/duxikufala.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/34505033730.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/99954790066.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/24854626748.pdfIn PDF document text
    • https://egf.tw/test2/images/file/79500255004.pdfIn 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 10560 bytes
SHA-256: 371384e827f996bc19314bdf85dbb9ca5a0f5ad0dedad5235e2a83bf051fb2bd
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 17360 bytes
SHA-256: 410ffa03b851653fae636a1d0bd20ef1621574db3a89933257048dd096039a24
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1