Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c76f51f38247a7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 18:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74226267070fff5f3282e342d0aef6c1 SHA-1: b8dd3849317680cd0b23113f56d456070e86d6d5 SHA-256: a0c76f51f38247a7d107a8d3e5b77d328e1f0503ad1ead4d095f531a3b8a5b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=season+5+mha+trailer PDF link annotation
    • http://pointerboards.com/uploads/admin/files/xezedigobilejutefotujojuw.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/9326820479.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c5aaa1c7c648368fda1a824e8667165/noxunezasetexuk.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/72609109511.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/78361509161.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9983559c0ea87360f80556c034e8808d/gipizawadefagena.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kukadogepobefugezikamixo.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/gaveroxejapelirawejulu.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/juladulusexezekoduvuxo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/warakuwasif.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fojenasotipotoxif.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902150251988696.pdfIn PDF document text
    • https://webaprint.be/img/file/lazaxomodulagekaradore.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/68674433021.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/38526940551.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379cdf9273b---jujoxozepusijuxaxez.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/85367022808.pdfIn PDF document text
    • https://terracell.info/images/file/9976337303.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/wevimag.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dipuni.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/77930506306.pdfIn PDF document text
    • https://digireg.sk/upload/79555602786.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/38049227973.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c77c52f9---wuxaramesabilirukewof.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 18076 bytes
SHA-256: b0eb05a04abce894abf71dc25b6db131c18d03f68b310021effa75ab6038a2bc
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10580 bytes
SHA-256: c6af63dd976d30e2e6ea8456e80b3a630fcfa83c3261d065016cfc5ea311837f

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