Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7101b289d78413…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 00:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f9f647b6377ee5c8076614660cfaa8b SHA-1: 87a9c740de230a755e2a1d7f560f42b582d9541e SHA-256: fe7101b289d78413c6144a9c400664d3839939967dfec951a185ec222e474f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://inwebjor.ru/uplcv?utm_term=download+minecraft+windows+10+edition+apk PDF link annotation
    • http://ibrahimalsada.com/pics/file/tuzuwetisinipovir.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/reforixusixakararazofivod.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/buvawijabimaribipax.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8969af07131814917f104f420de1097e/7899039923.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/67506952065.pdfIn PDF document text
    • https://inks.bg/userfiles/file/buxipenivopikazakegawuli.pdfIn PDF document text
    • http://vhshf.de/File/36939897219.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jolutuwelokeze.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/silosisugot.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pomudadodikan.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/59113792586.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/55932327160.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/56697581480.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/32226075533.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341bb38a4---puretenupiwas.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/damepazizixupaji.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc7f2df19---giwatusuvavesapiwanom.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/32607722180.pdfIn PDF document text
    • http://planetamama.ru/files/file/69371916597.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/73540667779.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/suvojimeduvosuv.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14424113481.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 11132 bytes
SHA-256: 40a3faac307eaf102ff9a48fa3ce0fdf3dd3e737b9aecb286d85272b619e23c4
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 17640 bytes
SHA-256: 16ccf91b4332fa1491caf4f4f89fb1634c8de57f40c62f14eab047a08fecb8c2