Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f8956dbef013ea…

MALICIOUS

PDF

84.5 KB Created: 2021-10-08 19:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a54e350470b6fc2fab3fc607a4763bd8 SHA-1: 55d4c1d1bb71d2ddc7b7531689d6a218f24a0ea6 SHA-256: 27f8956dbef013ea5098c0c2f0ae5f20d1c7ce47b9d9f5ee4ef657e03f899852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to external PDF files hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://newdimension.su/userfiles/file/89993462573.pdf In PDF document text
    • http://htygroup.com/upload/files/lavifunasowevele.pdfIn PDF document text
    • https://digicpictures.com/downloads/10802907769.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/31653634110.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/74262418566.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/45532354900.pdfIn PDF document text
    • http://apcmagon.com/userfiles/lagolokesam.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/293596431.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/josojofofivajabonin.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gagakap.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c40f003fca---5778133423.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jemakututapatesetixux.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/93309178019.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/67473611570.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b29780fcfa---79362594663.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d2ab4423d0ec24269732b9619e3a1b26/20236906143.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161591ea2d9cd6---zegukigulixatakagen.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/98054345633.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/zozowozofefetijupivu.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/dunuzejumimap.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2dc31d838---biwituzotelivobivenamu.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/81504363137.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/22658452211.pdfIn PDF document text
    • http://congtyvima.com/images/Download/javadetiweja.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/4318780545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=complete+shrine+map+botwPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffb66d380c---66431308019.pdfIn PDF document text
    • 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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 18928 bytes
SHA-256: e5cd6edde6c7c0edb8209c99601bd6d8b2e85d7df1435fc353332160901a8d5f
font_01_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 10772 bytes
SHA-256: df7b988c81787dc2039f848a21f7c78c5aa4ec69f7dc764249d4f5642bac9d34