Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b343b3ca3ce24ee…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 665258de4a6525470583ea683b4a13fc SHA-1: d5306bf8cd86ba6d47700760deee4a3bc6aaf4c5 SHA-256: 0b343b3ca3ce24ee4d7fb15f6e14334e808417965ce43445136fcc104bccc2c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or distributing further malware. The PDF structure and link farm behavior are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://tikatalog.sk/_files/file/butuxuxipexelimixumuf.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9a7daf84877ab87b558bbf4e8b3f7974/minalo.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/dbcc1897ce437363342c32ca55b8a4a6/5774174992.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92525428004.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9efb2a418---6951322988.pdfIn PDF document text
    • https://wagaskar.com/media/nopivawubuti.pdfIn PDF document text
    • http://usmleworkout.com/files/file/loxamolasutuwodoz.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/btmer5j75ul3c7migs0n5i4a3u/wamav.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/576d7186973ff99ec776a578fca769ac/kewepinobon.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/33445783078.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160839dff83cff---28332399631.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139eda2177---63468977658.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/31725180588.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75ad374a0c---fobipirepolem.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36357b12e9---zikep.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/98001436962.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ce93f3c21a85bfad8a6d4d32ade121b3/damabo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160706bf9bb513---kodedusufetijixapi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/58231542652.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980a35bd04c---xutapepiwakeja.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/anulobupe.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/56309869000.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/mopovovorupebojisefilewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=accommodation+approval+letter+to+employeePDF 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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16512 bytes
SHA-256: b9ec34866931ad70b321002a967d2469b56cd5a6988a41e7cbcf9c92466eea2c
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10668 bytes
SHA-256: bc8f62fcad56afff238a233a2b6eb4ba35b2301ac98365b26d097cd6d4fe71f2
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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