Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba528e5d57fe1201…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 09:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6614e018a74ece045feebcd736935e73 SHA-1: 854c9a202499299ec1d166876b1624fb0f658480 SHA-256: ba528e5d57fe12016fcbbb7d4c1666abe33edc3b817d11277f7c3b0ac35e5a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

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 https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ilqf8rcbver7hcbi97igjqa9gq/ranexubifi.pdf In PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/45111217538.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/10988473405.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/darijep.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/55qjrds5ta5aq3gbe76hlv9mom/66107251692.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb0009a26---meroxusukemipivesize.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/52838036688.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kamoxuxuzuxuru.pdfIn PDF document text
    • http://melvin.cz/data/93971425017.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/wezuwaxipimopusixawajot.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/luzovupubanoxave.pdfIn PDF document text
    • http://jngf.cn/files/file/rizasejarokexolokela.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/56822994301.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528020909.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zebipawalipawiloguj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bec9266d9---gotuxuvoxanexatowejidodav.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9483edca01---dejavodarafexejatebena.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/sitebelosunev.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeb6a31292---43226893224.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/63bcf34bf7aa1c6bd8eb8057d51593f0/96474751811.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/nexazoxifopap.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/luwobuvupevurafijugo.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/83572685454.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a62223ebd4---53124469824.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/68191659329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=folic+acid+structure+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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10588 bytes
SHA-256: b494976cc7dd7971de9b97f43632814adf00c237be4ced808bae10d3223b2ac9
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16724 bytes
SHA-256: 44b94f5f1b1232d37b16e5877b913daec2f293c1c3fe42cf3b376fe61dbe9d30
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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