Malicious PDF — malware analysis report

Static analysis result for SHA-256 beec1d9ca5af3f30…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 06:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4a8d97a201850837100a1acb9e01a6c SHA-1: 4c98788bbc5e831b4018c2e8e1091fa357bea0c1 SHA-256: beec1d9ca5af3f302c5e0cf4f4726703614e952e5ad33d98ea6c585f51440112
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nepalimodelagency.com/userfiles/file/74044009922.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8412c0facbe996be3f21e2f952c93e76/45179747419.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/46184266379.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160935487ad59c---moxites.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bebd64ef4---70041073611.pdfIn PDF document text
    • https://medtek.vn/storage/file/bovizal.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f417d86ce38538432ee3a95d229c2616/1967861277.pdfIn PDF document text
    • https://norservis.info/files/files/sesedumo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1b2rmjl33rotirmaik1rdl7jjm/99777505666.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856731b9e00---numagifopefusekasigej.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d967f890a0---52858598737.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/dedadiveniwatixebekogan.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/muvijutom.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6406059701.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defcbc3f6f3---42308775222.pdfIn PDF document text
    • http://abpaluso.com/upload/file/suxujejuxibakiwaxaruxox.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/tabivekive.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/buwuzabexafevojimiwogad.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/puvoriwetezefemonajuj.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/350097e70252939112efbeb2b13d441e/savojabalidogesil.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/20514147153.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/88740185116.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3df38f0a---34612864597.pdfIn PDF document text
    • http://carszana.com/image/upload/File/gekanijexesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=definition+of+terms+in+statistics+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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 10736 bytes
SHA-256: a97e0f4d4f1050e0a843835aaccae70e46d5b45c9ac9daaba390687af7a7b110
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 17988 bytes
SHA-256: c4a4b4e1355fb35ccdb1c2f286cd4a38bc15ac72f55efd85978bdea2edc37374
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1