Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb53a4f665cfc64…

MALICIOUS

PDF

81.9 KB Created: 2021-06-27 04:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c937ad9e9ecfacf789b306ea15c198c9 SHA-1: de575083784b63afc72e6ffcb16b707451bc056d SHA-256: 5fb53a4f665cfc64b72f681322ca4e01ca426786448ac5820e5f2cfd40dbeef0
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a technique often used to host phishing pages or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics and the compromised CMS upload link farm finding reinforce the assessment of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160799b18dea43---55376595949.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d0a0747188726ddd708f8eea3366b9a2/58345031202.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afd741da---66341841839.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/15945486797.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051116314638.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ce55ab45fbe2fb280d6f0c8cc069611f/36071100224.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c44c7aff295c40b5c8f3f1ad6d4d5eba/96009627456.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1cf09bf9---wemirimekewoduwebosofilak.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/929778c1d021aadc91ff28216d192cdc/mojalidilaki.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d30ed436---87995842152.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/85064063242.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/muvijolilupojilazepewo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb7c06884---wibefapamat.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9dfol08515mvh5cbu7fhs6rfh6/kezigesi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/11404733819.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b335f1209---satukozorofebopadaba.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca1f52b1a---lakuvonovokit.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4099a7f9d---mexidibevufasijobebexet.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/41bf36c33bd3131632c9b69144dad629/55748803079.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf1ee8dc85a2b83b002370950f875a78/nekoduwivurimisuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9dd94875---gikasesa.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/sowotakarokosaboxime.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/likemonatesaw.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af0ec263225---kidijunewok.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2ee863c7---riroti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=onlinewatchmovies+bollywood+pkPDF 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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 11200 bytes
SHA-256: 57c759799d453158ead6f5ffd2ff65095093bb60a8bdbcf384f307b37a3cd416
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 17564 bytes
SHA-256: e88a826d5c1a94fd85aeb4a95579636647c0431efd900a4a68c4fdbcda35c7b7
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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