Malicious PDF — malware analysis report

Static analysis result for SHA-256 c992b94cda2ffefe…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 07:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e643c326b8b4140cf0117c20256df269 SHA-1: 218a85c46cc861d1bfd7849c9fc1ccd7dd38dd73 SHA-256: c992b94cda2ffefeb45f6b8bff2638935ff7ee9934aa1516a896aa9e817b1b8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS uploads and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs further supports the likelihood of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161276d01f0563---jaxadazupe.pdf In PDF document text
    • https://mwasafat.com/uploads/files/guzanutudutejasogujara.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0a3027dbebd6985e7bae4b9aec3fc686/gipexikirirod.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/22402121981.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7bdd30c8c31920f724c8e06e57b4576e/86087486845.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30bf0274ca---wufofabav.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac930960f9e---2656628116.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gojunudoliko.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6btlo2qs6jr8i0j50tfuoji0bc/fekodonapokejonofe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160955eb763d7e---vosurenaja.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/64675548079.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/51535238368.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210630070349469.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf94a4aed---kazivanudotire.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/xuloboranovixito.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/delizagajabovajitizefej.pdfIn PDF document text
    • http://atomleasing.ru/media/File/37025128997.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/tavujumagenasirugebirifo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2eijnbqhvjl2o61c37m8v4qp0v/41339158696.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/nimijozubavofasovukixa.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6107c0a5907456322d7fb93f0d0a0749/50667613843.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xozemozobi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ekv7gl2966e759vmabf3isq20d/lubuvafexiwegezene.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba095a1e5a---jipixogikag.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ec086adee---kupovebawituniwunep.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/16523047812.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/75673123695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+compartment+raymond+carver+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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10720 bytes
SHA-256: 51b28fd2af63d4293adae68ba296eecb5211ee20fc16d356e503281c8a74aaf1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 17780 bytes
SHA-256: 34ec14546f3ea47578e67f30846b74f9ebdeba96aece4bd951cbe34ce17875f7