Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8d3845b5fa1e12…

MALICIOUS

PDF

101.1 KB Created: 2021-07-18 16:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc512db3fd64cded7783f7d08ff5ebf SHA-1: 43bb297c4b7111981de2fcef1019e454c5c75ed8 SHA-256: 9d8d3845b5fa1e12cad215799cb8ba0ab2efbcff936d43f300a41064dde2079d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096f49144aa6---58448552249.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abeb0f427---sowavixak.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c2a22946---niwovefesesewa.pdf
    • http://wildpflanzen-planung.de/file/58459470594.pdf
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/27126120604.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/59dedf62059d2e3f6145d59f3dccb79f/79474595241.pdf
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/venajikabof.pdf
    • https://planet-for-events.de/userfiles/file/bomuwod.pdf
    • http://adveotec.com/img/file/48783696401.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/52772250a5ba7285213910dcbbddf754/xafajatideze.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976a3f1ed86---zuketesodabelalowav.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e69a39aed---wigubebulubawogumuso.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/50c0dfb4d43d1297ecacf781be91ddb4/tuvuw.pdf
    • http://ttmplus.com/userfiles/files/252829800.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c481051---41612571659.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f073f1421c---26027579849.pdf
    • http://tehnicgaz.eu/files/file/monolikoguvomiputajam.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/44122428597.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9eab0c853679a0528c893b5d1d51444b/72840508373.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a77217fa20913d50d630877540d3e63e/60444600827.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608680b346683---ravedufiwagegagoxamovu.pdf
    • http://musorcentrum.hu/files/article/file/korekebuvisufagu.pdf
    • http://seoulsquare.com/userfiles/file/ririxeriwike.pdf
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/64375852510.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chapter+5+supply+economics+worksheet+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001230b.bin
2a92de8ce3b048728b7053f819253ff3306db0d17d821f2bf3c676682237cbb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 18568 bytes
font_01_sfnt_off000153f6.bin
94f20c53754fb45799ec3f1f1a0401be73a2cef1cfced5abcd08d5529340ceda
pdf-font-stream PDF embedded font (sfnt) at offset 0x153F6 11440 bytes
font_02_sfnt_off00016efa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFA 16792 bytes