Malicious PDF — malware analysis report

Static analysis result for SHA-256 20da2f9847cda5e3…

MALICIOUS

PDF

87.5 KB Created: 2021-08-15 17:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39c4ef7f0d79950263fbd8a39200ed76 SHA-1: d6801244f4d6d17056d74eacb0720599b2ee1a47 SHA-256: 20da2f9847cda5e365a5ff4828b54325a5a5edc1550a848809bf32fde1157079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=adanga+maru+movie+watch+online+tamilrockers PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ffab7b3f811717270823aaf34f016a52/45062411565.pdfIn PDF document text
    • http://alvitraders.com/files/todoxogopizifo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/kofenorisarugeju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161035c3402b36---82550427983.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/deddb31c310c56003969014f7f818df0/73497955699.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/596g7mrgjj6hbi1lvnt2m1hjbi/josovivezamuber.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/tifipudopu.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/40167063017.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6697b06ee1---56793345156.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50772329418.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/tanuweminutixotanojuvoto.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f1fc82e0---gexikezariduvonatixut.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078660524126---46639586932.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/90198237121.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6b67451b5396282d3d84457b92c8f224/gegejepijoduwuvefupuxow.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vvfik6jjp42bqbmmf3k4hvl7mg/nabexe.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/2405890239.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecd185d450---xerojujasezejokipitaz.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815462e3bbb---88259049952.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c306842dba---rabeluzepa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ed2480556---fikabulerixopenefuvur.pdfIn PDF document text
    • https://areicon.com/images/file/zufale.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qvsorbuvjpf32fej6sssbhe641/xukitiwemebapefotani.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/093cb67923cc9e8b863ce020a49c0879/30885160737.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/nijafilovagu.pdfIn PDF document text
    • 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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 11140 bytes
SHA-256: 7733f152a94d34d0614dc7293dc9667feaae22a1a581538d4fbcf04bc492d282
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 17160 bytes
SHA-256: a7321800dd85c94badf07cab4279bf864c5c2c2af9a344c55940838d5c983fda