Malicious PDF — malware analysis report

Static analysis result for SHA-256 5762c5064742542b…

MALICIOUS

PDF

89.9 KB Created: 2021-08-20 17:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3871fb1d55db16a6d91e5fb3e4cf0e3 SHA-1: 70f1c3e10c840513af930c5516d27e2c2d32916a SHA-256: 5762c5064742542b3e597181728b692195aa84d4dab290fbf7b0fef83ff5cb22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites and utilize SEO-related parameters. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083607e61105---44598838554.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nafupab.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/51961093375.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l09obd3j4q1saf81tkkea7hvf1/31483690866.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607445ca95bd2---zesedigozapufewezavow.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/96016745614.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/kebetupazamotibisam.pdfIn PDF document text
    • http://dsraxys.com/uploads/masigisevimatifa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a8b22c06---86191660683.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/sorupuxasani.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983bde8154f---22062826361.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/89031962569.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zuxagujexubaxij.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/87812017002.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/napomefifukedudosidamis.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af2bab88d---sezufofujepugenutupemoz.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2edfbf3d60f1a5e997267f9e31af3328/14251057735.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/31c179f2999f6162ae77c3612f1eb83c/dabejemakujatudegipozolo.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/14317864221.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/67iiitin36rq9623pph3q9smj8/potujoninor.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f1c0ad0a0e20fad3d73eaf19090870a1/lasawajodamidudizufuku.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/83838758775.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/43205191406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=windows+server+2003+r2+enterprise+x64+keyPDF 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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 11292 bytes
SHA-256: 5e877e30753fd9b697342f59eccc2a19bcf1df78a971d27d958d255dffd34832
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 21300 bytes
SHA-256: 9f91b5f4a27d436fe62ff9c950be99757ca00a6973d5620a2e4a40fcc3c991c8
font_02_sfnt_off00013f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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