Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d523330530ae31…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 07:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47232993f3cdb6ffcc6f8c00b4af5b79 SHA-1: 9aecb65edd61c841dcae04173e0491a609cd62ab SHA-256: 37d523330530ae31dd1cd21def6f63f0d012435fdea083db15376570c4a4e4d8
156 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 WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://okzawidow.pl/img/upload/files/27740795305.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b999a21b0---31846775336.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kn4lfrpfa26mn6j8lj31ga8m8c/85144195873.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e982a39bd75750f2adf7ce465503fbb4/masubebubadopikejusemiri.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/73905254348.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080281ecb962---51835518218.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb44c25bb7---ziwejotetalozefefup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc02cbe8bac---9663273535.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gomiwukitetegager.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gekigavufifinevegi.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/wulojoliraralinoxu.pdfIn PDF document text
    • http://thedreams.cz/files/xugexum.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c516686378e---56282147007.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086660159321---43107524261.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jdcimc1sro9df23rj53mm9ca43/43235938976.pdfIn PDF document text
    • https://2acontractor.it/images/file/84664433843.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/63810666537.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xuravifobel.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/besejepoxenudoneremade.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/72111874053.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/39462592353.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/jubagizowuditeride.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81426243094.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zowikibe.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/79158450882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dysfunctional+teams+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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 14404 bytes
SHA-256: fd5ce87454eb7940fe3b671f9a2927ad2b81f5372044be525be7e0fb3403e67f
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10896 bytes
SHA-256: 7eecd4e0d99eb06dcd5e25b2044ec0843c1daae012b279eeb3348c3517810f64
font_02_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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