Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d85cd9f8a41f264…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 08:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37fe28da08060b1df6042e8699a598b2 SHA-1: 84a3c4ad7e4436458b1c015e91318ec9131539c9 SHA-256: 3d85cd9f8a41f26401e85f59309c577cca67b7ded391e7b4c3809eb20d7eadb5
176 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'SE_QR_LURE' suggests a QR code redirect lure, though no QR code was explicitly found in the provided evidence. The primary attack pattern involves directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7d49ae8a72ae1ab71ce65e5e82b646e/ledolorurido.pdf In PDF document text
    • http://dcbestwings.com/uploads/files/28552801528.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/42977168319.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/95033256560.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/91647872920.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/riwubijisudakezara.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/sorilupalomemutukir.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/fasevokipebag.pdfIn PDF document text
    • http://c-amc.com/upload/files/zejudowolaze.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xarizoz.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/86429795203.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/nirorelif.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613458f16a0e4---zifit.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/91461479336.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/botekozoguvibujazide.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/74107494827.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/55590880425.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109101827565870.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/1992480517.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/18675063449.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/65185508465.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/17541979502.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/74376608703.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b7c97d2b---rerolawofilebiwi.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/90101523706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cara+mendapat+password+wifi+di+androidPDF 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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10732 bytes
SHA-256: c08ccadddc3aadae8cbe73972a2ebc440d486e7106977169fe268be09750ef2c
font_02_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 18288 bytes
SHA-256: 4dadcfd69a9690e9a40a2cf393aa48f3d268fe5ae0df739aa31797ab6a97fd7e

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