Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cd9817c42e5897…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 19:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: beb788a677e0672a90fc638c2fb9447f SHA-1: c1d93afd70fa6a54b8d6a2523b275eea0aa6d6d5 SHA-256: 79cd9817c42e58970a8f85deb1d754a9e1a663992a4c3813964f686fff861b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://podlahypilat.cz/admin/file/wobimebosagubokulorapoze.pdf In PDF document text
    • https://kede.org/userfiles/file/56232319525.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160837f5982c0a---kelabekebiniselerusogidiw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vs7q70k9oj4nb6nlevlvd4cun0/fikamugatirugenegujuna.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4bb8733ff8ef95a810be3d078c5b12e8/21299435800.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/komawuvonafojoru.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4397fdf51e---vajutaviz.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062109430070554.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/93973714620.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f0d6dfbd---3723635989.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pawarozunifejupebe.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tazome.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1820b9537e1badf5c9cee6e7ef89951c/dikimagomiladujufikadu.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96685641184.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/60574032401.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/556824510.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162257092816.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9b2e1708---bagevazenepogowogifadupu.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210620_205611.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/bamomunifa.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/63720585524.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/79351860118.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/79513175144.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/potuvudavumatub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=office+365+product+key+hackPDF 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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 11204 bytes
SHA-256: cebb6dec95767816218eaea710f4fd1d2cc3b77783eb5056e70a00e3b67b4d6c
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 17220 bytes
SHA-256: 972423e55a0e0e6b5cc1666e3d7526a1397870c87b2ca198d3b37051b1e02b11
font_02_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.