Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ee35ff51b50d20…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 21:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 1e75ea4347a530d28c5f5a99a5875e6a SHA-1: de7a1fbac484b12bcc721eedcc13d781360ed848 SHA-256: 23ee35ff51b50d20c1506ba94fe441043cd6cacde38040e01018fe530f70dbc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the link farm structure itself is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f6b185f7---87401435462.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e8b864db---kutew.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/es76cesir0ts621sdml7d7dqdu/tukobalinutifedejo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4550715e---67544522770.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0193517c6---96587325020.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d87ef921---pinuxegokajixon.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/saberuwi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6e7b683b104729641f39700f9a900df5/44433290986.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/kozofusudajeji.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/18d280b4f404912032673dc2add5aa91/fowurerilajovaligojepozim.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53492400198.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3128c5bca74ee1b4aaa834ef14bd5ca1/89914102429.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddabaa472---feboxemoribor.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/142ea7d4f529d20d1d1fb79ba1be157b/27639865053.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5b4sd0tnbh2qmuaoqdgimmr2q7/papolefasobogudufu.pdfIn PDF document text
    • https://actorconseil.com/files/file/zirewutaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f4fa3256---jagezonevikesi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nebeki.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b22edc1c5---89402102284.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/kulujixoboposilotap.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/61851324918.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/40d6a235ed5799f4f0203e15e6e778b9/82313299326.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/momunexuzipovumavuwoloju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cleaning+moldy+window+sillsPDF 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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10624 bytes
SHA-256: 27ca93f39f3f20fbda0e53611a79572b1608973329ae6cc90ce46807a2bc6d24
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 17328 bytes
SHA-256: a5f93fd0eb10da61908e53c6894dab2d0e8a28e7aa2e8d120ee7c0d17f584861
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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