Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3b717650bc2411…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 20:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6d160b78b1edffba219fcc3345e52da SHA-1: c2f54068e875ca2a9fcc3a057b5f01fc7114ec08 SHA-256: de3b717650bc241165e06c35a9cc824154b1bb9923f31bcebb4909d1ba53d4cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://youngdongtec.com/userfiles/file/52734916797.pdf In PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/4686303018.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jazur.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630871772.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/94333142614.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jujamikerisesanun.pdfIn PDF document text
    • http://exima.kr/userData/board/file/bopufe.pdfIn PDF document text
    • https://angkagenap.com/contents/files/24713029199.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161302027719ad---nemakinox.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ivrnuc873if180rogjs0it9ijk/davuked.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109070516541842.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cba5d5f4a90150a01bc73b7616168aa5/2247914295.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/buwujedigobosubudugad.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/titom.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kidetuwesukizot.pdfIn PDF document text
    • https://turbooto.vn/upload/files/tewaketo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c9d2a539a1bec008cee70f972c5226a/14916017619.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/13202899233.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/15680541006.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/25592480040.pdfIn PDF document text
    • http://hmed.vn/upload/files/xupovoruzivigoluzefujuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=anantharaman+paleontology+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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17700 bytes
SHA-256: 96d6bcc54ac8576df5370b15d2711d38c10dcb0a89daba9ef962c8c15ba28ac4
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 10780 bytes
SHA-256: 6d45a668da932581243e9b637c615eff4e51dcca8f1f45f6ebcd3eb3cc318820
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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