Malicious PDF — malware analysis report

Static analysis result for SHA-256 5781887912c6e403…

MALICIOUS

PDF

118.0 KB Created: 2021-07-14 06:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4799840701285922145befae5cf7a6c SHA-1: ad3f5478688660cac10b2faa62b77520106ad095 SHA-256: 5781887912c6e4034d1a32f2406e86cc438a9d2acdb0c604772985f9a18db720
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 WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/288e2938a6da5c2a5d9e0e8aec70db2f/64650718765.pdf In PDF document text
    • http://gdgom.com/upload/file/210702165935439495cae02tpe1wbv.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bccb8621c---dowiluj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9898ad998ee39efef20989971ed334a3/fesefemekoxetib.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/dipusodov.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4gk2u9108736jale9tfan5vo9l/joxasivajulegoj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f77a2885---97303539338.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/10775116684.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/43269981834.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kejoleseke.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/00bde9011dad47ec3cc323b4843cfca4/46129579154.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9a6eca12d801f91871c7f773c18af3ea/kelamopurobinixagegoreme.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe54a29bdb9520123f82d35eb9b6eea2/dokofepunikadi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a26949c55---37034437453.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/2967356186.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ps441bkpeb2ajbfpvenlig97d2/67504796274.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9bd0e6c42fa039571c03164191f5e7ea/firasat.pdfIn PDF document text
    • http://bakoca.hu/files/file/posetuzisuvadakane.pdfIn PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/sezowirotejosijinemawogo.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/59346625456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+difference+between+linear+speed+and+rotational+speedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6B 10936 bytes
SHA-256: afffb566c06f523b184c704f102a90dd0e742788a2e617b6b8046c24b7e8cfc0
font_01_sfnt_off00016485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16485 20340 bytes
SHA-256: f6336b9389c91a8a059c7be510b6c45063c706bcb38926f136d69fd6203e5d36
font_02_sfnt_off00019b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B38D 16280 bytes
SHA-256: 07fa698810e620601b48ea7b99e98911fa167db031a626c7c83df3136f0eb06f

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