Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb9db06424edc19…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 11:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48d0de03a66ec6beca4f9614ef4cac0b SHA-1: f6daef20a531ceae4a459d5ddf1ad208522d6d89 SHA-256: ffb9db06424edc19bcefed19b19661ff5366d792518c29e12a1859c227c57cdc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many hosted on compromised CMS platforms or disposable domains, suggest a campaign to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 68 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://coretry.ru/uplcv?utm_term=digimon+gba+rom+download PDF link annotation
    • https://snowcat.pl/admin/ckfinder/userfiles/files/selemipufixaluxuv.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/puliz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0c68c6c60bb0f371ec7dcfb1431fa3fd/diwow.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/sajilolulu.pdfIn PDF document text
    • http://chicopharm.com/upload/files/golosorapaxuxug.pdfIn PDF document text
    • http://sentai.cc/data/file/20210915_214436_860.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/63630292008.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141522b472cb---busazamitufuvifufunop.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/wutupudukamo.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/80420715962.pdfIn PDF document text
    • http://rongqichem.com/upload/files/somififunusakoxakalujer.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/88317251655.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zerarowomupi.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/62983702487.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/fegolevubulevij.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210919133001.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/61432332895.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/40960793675.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/95191086191.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/gixitafixijixeluw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145f898c6610---32044217217.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/lugibivevelulajamitef.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/17337206380.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210918220206.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34891067165.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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 14008 bytes
SHA-256: d356c093e462ea6aab4743506d5748655114065610f83b3eee0a3ba0a440eec0
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10420 bytes
SHA-256: 1561ff43fe08498db182565d7ddb581bb9efa4cc862a470e52b79bcee4cbb94c