Malicious PDF — malware analysis report

Static analysis result for SHA-256 91af6aa376ffcbfb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab8e542688d10d3c6f61a8293a996365 SHA-1: 3e21fb1f406bca845c77df1338a3daa710ca240b SHA-256: 91af6aa376ffcbfbdfb4935c75e8efe62ffe26161bf498956d16ff0a6ce9f5f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a compromised WordPress site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a deceptive purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be901ae36c---93955941051.pdf In PDF document text
    • http://erfaspot.com/resimler/files/zebipivoxobitaxipijanodi.pdfIn PDF document text
    • https://fobh.net/userfiles/files/felewapagakituza.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/44756688640.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/fataj.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/39334482256.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vekuvigelasuras.pdfIn PDF document text
    • http://ausafe.net/images/art/files/41218090169.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/26511454776.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7d69651bcd944d3a1472ef859fa39094/jufeboxukugadaz.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/xisitupejiritixefemolin.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/pubogom.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/58400262026.pdfIn PDF document text
    • http://www.polni.si/Images/files/belirir.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/83758395985.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/3172833460.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7682494797.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/guziwubinuwajadig.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/wokow.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/69510115318.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/61b74e7dee76d7a2c8859900303ff4b8/dasamigofukobeg.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/19842988899.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e3874a461f85e4ad08e8ff390bff56a2/32402445093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+there+a+youtube+downloader+for+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/zedowibovin.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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10840 bytes
SHA-256: b74483dd2f285282d0f82f111de735b48ff76dd44e38460fac9a13ee80092566
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 16820 bytes
SHA-256: ef3d1bd8e26857021e15d36031712bf17d5264e984d26ef6b8efcf27564a0a80
font_02_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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