Malicious PDF — malware analysis report

Static analysis result for SHA-256 016e0f5aefe58f54…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 13:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77c2a0496b5618f351e575bb9c64a3bb SHA-1: 9cbf66080e65e4af32bfd30cfe15a9cf591bd1b1 SHA-256: 016e0f5aefe58f54797c19abd66833ec82e805ae20c6668ca113fbe1f322864c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites and disposable hosting domains. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=wifi+decoder+android PDF link annotation
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/bozem.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wetetu.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rujax.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/710cdeb565c1375a993b7e361d8959dc/gazitewutalefuxolopow.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/bomes.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jimafakofomukibisa.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/vonixuvitukugupomujof.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/77251968321.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/gamewi.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/81178331947.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kisegadozeruboxagobuzabi.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/fizimiwemosirot.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/buzivo.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/55192759241.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dajunixutotivimid.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/76522159782.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/mutodeleripijas.pdfIn PDF document text
    • https://dom-titan.rs/files/ludog.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/tedoxekuluwigavunalojo.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xolefomexivira.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/kojono.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/peluvutokizaberob.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nopobujulexuzig.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5184d5f5ac30ae73148a2dd2868aa79c/gegezedularezutubunejovu.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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 10152 bytes
SHA-256: 103d4ce55199bbfdb55948c720ab73e155566e7a5399caf8007e4b73d48dd543
font_02_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16684 bytes
SHA-256: 5fbe98a56e1cbf381329c5feae029ed7d08a49bb1394a7dbcb91be6ae2cb6f9d

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