Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0e2d1880010171…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 14:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61f24ab3120332924de6c8a435739b0f SHA-1: c44dbc035e82b7ff655d87ffbb67e57a6ee27b6e SHA-256: 3b0e2d1880010171bd8ffbc982866e12ddf020acde4bb2ff9c7954aa76e91bb9
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm on compromised CMS hosting, with one URL pointing to a PDF hosted on a WordPress upload directory. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139205eee26d---46683903304.pdf In PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/zokegipuniramegukavababa.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/lokotufasugadevik.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/39765880369.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/82990711843.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gujemuwigamazitimef.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dulinopunebigejupox.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lulepifalixoj.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/99652602754.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/69171983961.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/niluxoz.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/kegonefudorusew.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/lukunexewe.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315946b1c05---59031335529.pdfIn PDF document text
    • https://kawanmto.org/contents/files/75124528880.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/kuxesadabapifel.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/23956770521.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xuwobiwilosuwelibatutumi.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/wewigefivup.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/57806870947.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/jewujivinogajibana.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/biwudisadunigenenexifam.pdfIn PDF document text
    • http://cortabellanews.com/userimages/guxelowabawitezoba.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/84315370286.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f951adf64---mamitatuwufekefodaloguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hello+chinese+apk+premiumPDF 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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16904 bytes
SHA-256: e47ba511d45c0eba7b974d138d8ae7db4d082b75506cce4a788594281912170f
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 10724 bytes
SHA-256: 6426a98e7db86b0a2f51d8f270101eaca765413f4e9c1b8ecf9a8a8507a36b7b

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