Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e3f38441606bd3…

MALICIOUS

PDF

101.5 KB Created: 2021-08-01 05:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6b4021837c383cbc9edcef52767601a SHA-1: 49a4e5489aa0685c6c97b6d37eebbce2db68d857 SHA-256: 33e3f38441606bd37a77e3ac558a0f1306de03bf889ff3ac76d1cb03a139ef8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cca4942c3---46340049451.pdf In PDF document text
    • http://inglewood1968.com/clients/68690/File/jidifuvafafakule.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ba96d9005---diguwenope.pdfIn PDF document text
    • https://hirurgija.me//files/mokerez.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/35543198161.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/14133104352.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/riredumivawogebasipibiba.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fosukekukegofirubegiz.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/mofijifub.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/tijipife.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/80678835719.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d9607234---nasafinuxekarujapifiret.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/polakulenijuruwebadolem.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/43950471730.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/vifolix.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kh3ko63o7gpnmsh49reho2nan2/28810415689.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc85ed722---kixodukej.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/72609425662.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/wunexemi.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/fizukakowuxik.pdfIn PDF document text
    • https://keongracun.org/contents//files/45320139484.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/j3dd047sb5qmidqv9c3d0de5o3/xowodewezixot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=remix+os+download+64+bit+uptodownPDF 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_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 18608 bytes
SHA-256: f932c38150e34b31db534c8b75767b904f63f7fccf07471ed2d9f2f3ca68ca76
font_01_sfnt_off000155d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE9 11172 bytes
SHA-256: f96963fa635a051336853118c7a901358138cea8d9edda162033ed63b7933915

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