Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6c1e4c844abdab…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84a7224bb678eb61c9659410f127335e SHA-1: 616012cbc0a63a5bc57f6f6e4b6ca6b68de82201 SHA-256: 8c6c1e4c844abdabfb4a026b7c57a08c164cd91c70c9ac7ee3ad88ad7255d734
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c4e64bf7f520a28a29073dc5420c3c56/jufifatabevebubogoxed.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b7c4ccdbe758921f355cb3389d984cc3/laluno.pdfIn PDF document text
    • https://luminex.pl/upload/file/38053632794.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611342ac0d52b---fezotonibalukurano.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/64083183796.pdfIn PDF document text
    • http://samtekelektrik.com/files/33557362240.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210513070917.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/83652040215.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/kofibap.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7998f24964d39c59b79c2bb2531e5f9b/15179098365.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kq1ka44kvpde8a6tlshqhtk5rp/53926036120.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e15c64589---petabemitexenazivibujozek.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944ec689748---pisotebipomavapuro.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/rurupekedoguxefurorare.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5a0ebljj13c4qf5kv2436l66gc/92787021144.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/440d63cb944e0091fec93e7fb99f67b7/72650152879.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a1qe76vclt7cn2rahquhrh9r9q/tusubelakufekadovoxe.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/28761330858.pdfIn PDF document text
    • http://partnercable.hu/files/bosuvisogepuzez.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/8327316418.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/konutakobejemotesi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/kodezemozasilobonobugumab.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/nexusipuxilorijuxanamavex.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e54c31924---30663898875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=annular+solar+eclipse+meaningPDF 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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 15128 bytes
SHA-256: b307be1299a5ed248a1c22ea8ae09bc609fc7a44b8e90baa974bdbd533e8d931
font_01_sfnt_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 10700 bytes
SHA-256: 1d9024e3704269f6f3930991062e0ac1847ec724bf0eab19d9acd37aacab2adb