Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3dbeca41a4963c…

MALICIOUS

PDF

209.4 KB Created: 2021-06-29 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89a85b9059273684518ac0816497fd80 SHA-1: 0d15a90951ff935661af1eca0fb13946e7245ec8 SHA-256: 8d3dbeca41a4963c28269f521af67808d4c3429cb0dbe9ac46083bfd8b7f23f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a phishing lure, including a link farm pointing to compromised CMS uploads and SEO redirectors. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/43c5d93497aed62e4438e43b22b1ad72/73465411825.pdf In PDF document text
    • http://inwama4.vn/webroot/img/files/xowimisasu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/64418182532.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4770c3a512510c9b5db359d64b32f012/gudofokixakisija.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebc8627e7---33853596202.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b678a0a6---vogifurerexaminubiwoje.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/witonotoroj.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/24f76f140b7470744398a5a2f7e3ceed/26205023773.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/fagepubenevaxejigi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/87b0hsrlr72nqpbkfqv7hukdk5/xogoluk.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f922eb2cccc86bb4ce390712bf25b36b/mawevugefale.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b35c2b62e290f6c5d264c58cbdea21da/98636158096.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/50977554350.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9a35b36e7a5c2f438efa9c59cd1f4c47/25992742501.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bbe549e5---22826134242.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8b09cf306ee1b3cb834475307b3a45f9/73673128355.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9dd036a7---nufuduvoxupo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf252b525b---buguvexuxubazonesuroxo.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/satawuxuperiduwanenera.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9c8d3d8a45c3ee19984f234558b8efbf/kilajorigejem.pdfIn PDF document text
    • http://kleiberit.ru/files/file/damarabaxerowalukomuw.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdf7a06bf---wenagizuseda.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/meguvajinowore.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16752f0ff---19571327190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=himalayan+forest+research+institutePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002bc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC57 10808 bytes
SHA-256: af417daf38aa2029cd82d73c19eb8d5ceed852f7148c8b29373b4beee916d886
font_01_sfnt_off0002d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D503 4952 bytes
SHA-256: 22c88089d0ba52a141c2246232923c954e7ab0db0233c5cceec123d8b9391799
font_02_sfnt_off0002e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6F6 21980 bytes
SHA-256: d4a3e07786d4c8cf8caf792149a03585a0bc55737bd8984cfbecb7366c3b5160
font_03_sfnt_off00031ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1