Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdb3cbe8bdbe25c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 05:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5bb75bf3d35a030866c796aafb72754 SHA-1: 83fd2a9585440cb826b6fa92f1e369cfd8630463 SHA-256: 4fdb3cbe8bdbe25c06c78e84669c9fe14aa49f3aaabd4e135674d1a3b9c031b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'network marketing business plan' lure in one of the URLs indicates a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gulfapex.com/uploads/file/94379620157.pdf In PDF document text
    • https://latework.cz/soubory/mexakogikiwigo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/71453819894.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/denokozujosovirupepatinu.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/tobakakisixekidubusa.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/divaloralokuki.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/mepewulo.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/bekikimaniziwefabi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138190a54e11---54169824291.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zolopokafarufakerifa.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/taruvuneridato.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/10002014604.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/61939958523.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/xopugukogipidadare.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229a240d---67714712106.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zaxufanojoluxiladerako.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d042d475112bdf52d472e9ac8300504f/35582408931.pdfIn PDF document text
    • https://shevian.com/images/file/sakubip.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nisegivurag.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/46086968766.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/67400569774.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/lonalojuvotigibe.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/zimukigigokefamukejefume.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/baxijujegigomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=network+marketing+business+plan+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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 11236 bytes
SHA-256: 2b78e3eb6f0df8b1d370e583422ce2e14418b8a32773fac954c763d209024688
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 16800 bytes
SHA-256: c66ae8cc295e66d224767f6fd14f0b162a21008e4d2e6c2ffd49955a167275fb
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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