Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8439d2178cbdbf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 06:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7f6f14d0c71760343a646cf186ad303d SHA-1: 552b71cd2ad6f55ec137d15253d73c936859b26e SHA-256: 9f8439d2178cbdbfd4ab32ffff7a3f5b801cc6317d65a9c03d10dc4755be14d5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=free+fonts+for+android+10 PDF link annotation
    • https://sangolongphuong.vn/longphuong/news/files/zodimuxedujategiwurojat.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/10866513548.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/63739253319.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc9ddbba3---46742977677.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/88017382816.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4789e954e---dulufubugadigagopeb.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/gosexukinari.pdfIn PDF document text
    • https://phukienbep.net/media/files/47260306119.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/mumikovatifimajilizixi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/68752628638.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/risofubilisovubasa.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/zujuderavibetax.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tlst4ha22o0veb216gjaedpiip/sewedaniraturubozon.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/71155540089.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/mepukefofogipolokiwil.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/41668635947.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/ziwopejopobogupivabop.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/pikosete.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/josajakegonubagut.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/nuzegi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/11a6d9fc7af477f93e9118e3d278f282/65042081393.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/gobelezawijujavisuturapa.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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 17304 bytes
SHA-256: 25167914f42cd55e7eaa0fca75a2b8eb7abd48727d7ea67b0b907f63ad89dfa4
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 10452 bytes
SHA-256: 03412d2eff92912e66dec574a18197e3c8d79eb1806171336f1796977c9a034b

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