Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ddaf5c95b9afd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 21:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2f2f657a63c77bcbea68cdaee4d78f1 SHA-1: dcd6cef3589de697501edea7a3d764feab4efcf6 SHA-256: bc7ddaf5c95b9afd98a744c4fae20917d5a9e62d11120d4444460923545e87e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the 'urgency lure' heuristic further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bjhtdszdh.com/v15/Upload/file/2021728110361995.pdf In PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/24554571225.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rosefexebojaw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262477c0123---6610172757.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gexapedozebumejuguvutefo.pdfIn PDF document text
    • http://fitviewer.de/files/file/62792319464.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/momusavu.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/ludexivozujarowepobeput.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/vevunozodumup.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1b445c13789b89a58e0542e61a6b1a24/80268508043.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/2249277196.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0205313f---noleberosowosulogenom.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/be5f74daa6af1e71dfd6091ac8ba10bc/mesumefusibukonobo.pdfIn PDF document text
    • http://derma-dts.de/files/file/68690605943.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/obc8r8ar8pjel55p4ggctkk460/dokoser.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/poguvusojimokiz.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bb96266b---gejuxigawulimumilomigo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bixovurapomugovobefaxored.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a56e2db76d294ef1a199d389f23e45d/linezopumugogotugakawuvi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/sgrpb7bmrdi41gs85ib004eamc/23602443872.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947d24e1d09---rofeperupuwarawipamekewi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/60183545292.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vrla1dk0qakhm1rp91vq4110h6/19530122284.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fagekivokir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831756c415b---19392787341.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/30351974366.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tf7esf0bpdervhv2aob3pgcr5h/11690581373.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o92a3irhog0p166nth630p1kr9/72149222136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=abc+physics+book+pdfPDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 10404 bytes
SHA-256: eee625c990ab023cc66d21bac012fbe8bc04b6195730cb23e75e91e452667d91
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 19168 bytes
SHA-256: ca09f5c7c2c0adca763cc4d1310e478c88d19d809ca3a20d69fbd4c30c67d2ae

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