Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50b62b53ad8cb42…

MALICIOUS

PDF

90.7 KB Created: 2021-07-19 22:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0391bd82af5ba47b4e08a50aa9040a77 SHA-1: ad3ac16d66143220a26d0df81f430c3a461e7079 SHA-256: b50b62b53ad8cb42a1cdfbe2789b4eb3cbcfd8468012c638c1fa2972814e8078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://vankouwenenmastop.nl/UserFiles/file/kefetadab.pdf In PDF document text
    • https://aspaeng.com/files/image/files/86874459204.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/rogugirumuwapojuda.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2eaaee1d0729ab37db91f17b47493404/64548980691.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210605040905.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9uub2p5fkd4g4c4c2toikc6pcl/kipiso.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071204e94e6b---julaxefikab.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/66966853108.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dde40cf6b4f2122a1f8248b2eaaa8469/megodijebaw.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/37749e238d7d7863730cc2c09b1f4e87/sipigibegabitatebifofe.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wopuzuxusexagavukuzovalik.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/xazudiluf.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2qt8r9t1bd180om99j6jj3tm0/63067578621.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/11043027947.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6742c97df4c397d9cf175a14639e8756/fijotebaxoxodonip.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1e5c98cb290b28ae6b3cbb968d0866a6/25863248291.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c26345d627da5a7ac21707f9f6947342/19884696143.pdfIn PDF document text
    • http://pvvc.cz/files/22292979475.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/28c329699486a6cc9fbc88fd29b0b497/lebarigabexo.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/4844990632.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb5fbee88---medabepi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607517087531b---80671023758.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/tudebusokevadupavem.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jagabet.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/dovipozono.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/2091752373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=7mm+to+inchesPDF 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_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10140 bytes
SHA-256: 95679927da3b6aca4b1530441918090e0603b17e46c0f27ea14e056b6d36d63f
font_01_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 17308 bytes
SHA-256: 87951cec03df2edc04756dba7511f8ec22661236d653c9abcd4619ead5ff2850
font_02_sfnt_off0001456e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1