Malicious PDF — malware analysis report

Static analysis result for SHA-256 65db200bde5cc76e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50ced561ac4eb73e01bd3064a08a5258 SHA-1: 544cacb7f945baf59dc59a2b55e7282435071d60 SHA-256: 65db200bde5cc76ef27247656ec070e91c2f2916710c18c329bbc9a6c2c67c32
156 Risk Score

Malware Insights

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

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, with many embedded URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cioccolatogallucci.it/userfiles/file/vusexopawutagiw.pdf In PDF document text
    • https://hongmao.tw/uploads/files/202109111558231304.pdfIn PDF document text
    • https://biocoils.com/img/file/60472180491.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/mekirof.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/fifesugiradevof.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/4064836293.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/86315453776.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/69215314136.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9mm12u955pvis69imu3kjetq1/72667763748.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nopipavanarigov.pdfIn PDF document text
    • http://iphysiology.ru/upload/15805528331.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/fakibeniposolude.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/18433289916.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/jinuvozoxedifazitojut.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/93268064639.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/gajemukaxuvelaxefufevux.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-12/20210912002547903285.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/texafepukovodomexumiwize.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/24299631357.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/taxaduvamiwupe.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/80705491232.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/memusewefunenawazukivujaz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f252d3fb45---45696520747.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/46e1d2c8a13ff0fd75a666127c326141/54426854694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=passion+puzzle+apkPDF 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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 10300 bytes
SHA-256: 276ec72029955f5f7f4a25796acd35880edc172c80944e23c8d7fd040be87b89
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 14584 bytes
SHA-256: e598d5724ef371b7e61e15b3ac790568579ca69d0a51a88d8ca034d365270d8e