Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3080b43691f3ac…

MALICIOUS

PDF

70.0 KB Created: 2021-09-02 13:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d90ec4f483864588a496aee2b832d0bd SHA-1: 397b9e2c912baa4f9de66a57520aa2ccc7988a95 SHA-256: 5b3080b43691f3acbfe2f0725161567d286e9b2a033e5f5ee93674d77f691ae4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, utilizing an image-only presentation with embedded action triggers to direct users to external URLs. Numerous heuristics indicate a link farm structure, with many links pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further payloads or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=work+breakdown+structure+examples+for+project+management+pdf PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fc964e066652b15f4e53243f227d18d5/golitopexutufi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pepumixerifogix.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/eae8c6eecd2902e066f1be505e00d0e5/55648684737.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/keneli.pdfIn PDF document text
    • http://nfc.soo.jp/file/gurilakolotekaje.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/woxizogovemijux.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/taxob.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/wufepufuzuro.pdfIn PDF document text
    • https://stotex.rs//files/wogiraseje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad7b1bb65---88469118681.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de517a773---gizukujupaw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mg52io6kb7pdhq84jjjplmo601/7188336665.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/76636202698.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/sikemikunanofoxi.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/46205544292.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zilijolujazumewodevu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/10017357598.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/792ce7f929c58cb9b8ca0a316d005945/sojikuwifibobazunej.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b33ca11630a7b8ac8d72e2e1f855bd07/18251911731.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/fojufakewafegodomonuk.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd372fcc12e---29355356240.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a2e3312e6f8fc6a14111f4c54a330b8c/pogerogafamisefur.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/xabejatopi.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/b7hvh5sbqm68mapd1l0vq0rtj7/46024137846.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3op6p9oa08o712pdedk7v82e5m/fikorelip.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_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 11512 bytes
SHA-256: 8412a85cad8fec8a7d62805cdd5276550e1e448632dc18abb52662050e76cc29
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 13892 bytes
SHA-256: eb148469056d8eddc08fb0a31b0f75b3029d1b7b50de134d3479cd34f61264ba
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1