Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b08b7e73997c099…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 06:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5d5f049465b5ae735ed47f9678fae90 SHA-1: a490554b47308e93be2641a682e20014e54c923f SHA-256: 5b08b7e73997c0992e638a1a798d90be4caf16f5aea6307efe1757c0e51ee49a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://hondaotohaiphong.vn/upload/files/mefufo.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135835fdd1c2---7356560599.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/83994132903.pdfIn PDF document text
    • http://c-six.it/userfiles/files/gakenovaxipigatewofidob.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/kovode.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/55039788115.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/51785328032.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/vufubepele.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/46631099656.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/90935470923.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/94938669423.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/goniwag.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/melitilurizobepakekutopow.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1bccfd43bb8b1a993eb9e85cbf9018ae/95913787589.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9dc609fc77f3583c8fc846c79d68fe6/tebulipakowijinuxoli.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/sadoxekibozetosa.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/boxutigexajo.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rotalaxatikudalapavif.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/92079177859.pdfIn PDF document text
    • http://guchen.ru/d/files/67619210659.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/6180362639.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347f8d08854---78738654032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mx+player+pro+latest+version+apk+downloadPDF 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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10836 bytes
SHA-256: 11fae083c6963ec42d0f27077c110473e5fb393a53f91d2f0d5dbea0ef6840f4
font_02_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 17208 bytes
SHA-256: e446fe6971b385d1d08c123d0ede21380a4c68d6b82f70af922aaeaa7b71908d

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