Malicious PDF — malware analysis report

Static analysis result for SHA-256 583fd4f6fedb179b…

MALICIOUS

PDF

109.3 KB Created: 2021-09-06 00:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d49cedea681301cf1120b234f946280 SHA-1: 891ce814fbef62d39c3220c16b803f3d73772af0 SHA-256: 583fd4f6fedb179b2810b3a06251ac9d5f95982cd8576fd7d811a8eed72292cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/raa8fmjii1hlqmn51dbg962fmm/tabidumuterikafawefuwa.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123804156548---vumaxujosaxitiv.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/17835674340.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24394e657c---42746634193.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/goxolasifopida.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f2670ef94---41869522666.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/38195157302.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/071b87820fb1cd51e294a1741cbe63c3/seximemibeloxulopepuxe.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/jukibobonazama.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wokugodimeruzu.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/dimimunifujik.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/sewixibuf.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/zodopinapufeximolutodi.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/82156644219.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/rudebitajekuzimewoxirezu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/70935999764.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/91971950921.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/xomidabepuwab.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/lumofonuz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4a44e879---75816568895.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba145546e---96852674277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=osha+confined+space+entry+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_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E06 18652 bytes
SHA-256: 881c62dc8e6c3d155362854159c119501a6cefa9590e543012173ac38971db3a
font_02_sfnt_off00018e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8C 10808 bytes
SHA-256: 027b8b3488be242b967d76c01fc60ee5d012c7c0181924fadd5ccc23f8a4fc16

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