Malicious PDF — malware analysis report

Static analysis result for SHA-256 33963c9ebca05f7b…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 17:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 12ae38521a5f706edcc9d63031059b4e SHA-1: e68ac224f7168de1ae7a55acbc6083edb01376a1 SHA-256: 33963c9ebca05f7b262aff7ab01d4ebcb94efc34ac98988a63a581aca8a5bb54
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://halaljones.com/uploads/files/15203521872.pdf In PDF document text
    • http://vendax.ro/files/file/76938676658.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wadozorivodo.pdfIn PDF document text
    • http://lovesenergy.nl/file/gumoto.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fdg65gk7hfdug7hl46cdjpvf83/42829475520.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913225008.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zovag.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dj5ivijjhpfd4hhc9e5t7vo08/nonoputubivafaxowefupufob.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/7382885549.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/12dae49cacd83c60f531a5739226f79a/joroxupezamunasex.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/palipokebokavezonaxok.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/36907253317.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/tefonefafix.pdfIn PDF document text
    • https://justtigers.com/cmswithfiles/file/barelapowut.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2582940673.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/javale.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3f4qna8g5epae566hgb43bglmu/18181877187.pdfIn PDF document text
    • http://poiskvod.ru/images/file/47791693173.pdfIn PDF document text
    • https://elemonbg.com/Files/File/78454489187.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/xominibusajadusu.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/gotuzutagad.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/64588603153.pdfIn PDF document text
    • https://goodline.by/userfiles/file/gizimitupano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=distance+time+graph+for+uniform+velocityPDF 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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 17752 bytes
SHA-256: a0134fe44db9aab0e45847ae49c5ab334f76c2070d43fe4a0e03b547686d037c
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 11208 bytes
SHA-256: 792496ba358b15459410e8bc55a3b77e7cfbb63c8c50ad70fbf192e4a20132a4
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1