Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5845a47e676eed…

MALICIOUS

PDF

89.4 KB Created: 2021-08-18 09:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb319e5e5e3f97610fe7a2db0a42bbc9 SHA-1: 2fd1119e17ea2fc05044a41dd6c394f21511458d SHA-256: 3d5845a47e676eed645277a4f21dfd8a798a3d86ea71f6761017498ee841107e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://cructi.ru/uplcv?utm_term=how+to+pair+infant+optics+dxr-5 PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8vsqtdgc3lfp6b6104ub1sl4m1/68961081593.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/naveranabeletekuvawula.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d669f89f2ee---kawupakilifa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdb4c1377---42437924598.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/kibozanixuwidatuvipoket.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/82127711283.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexunuve.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/25386257866.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/keneli.pdfIn PDF document text
    • http://sooclose.eu/upload/File/8832189103.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/wadegegakav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e834007e9aa---69043270599.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/baxofesemimuvalum.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2c4b7f22---99290585266.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/31a1chfb3170eej3esc3q00uev/soterorabijivenenerav.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/biwizarigogu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a0b9c3311cf3446486fb6b59f0923f62/60539168089.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k6svb3h0h7b4nm6f7jgbs8vrb4/35188931690.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/xaxaxonironupuz.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108131217324589.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e2aa3157---61823777578.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/76966811249.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/73160882245.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17576 bytes
SHA-256: 132c497289047f83fabc36839c0db670ce51b8816479de16c1783a6b5397969a
font_01_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 10784 bytes
SHA-256: 180d809922746e29e77460e7317935ba0341a4144704546d92a628e74a0cf405
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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