Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dd52a268abc775…

MALICIOUS

PDF

89.2 KB Created: 2021-07-23 04:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da3debc44fccb6f7178b9cd1eb61ebf9 SHA-1: 5e7f6119cf4755e5fa4a03d831fce40e9aadcc1c SHA-256: 66dd52a268abc7756b0ecd9090ad0618efa41a88f196289fbf971859658e0718
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, potentially leading users to malicious content, and is presented as a fake invoice or payment lure. While no scripts were directly extracted, the PDF structure and associated URLs suggest an attempt to redirect users to a malicious site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.victoriousintl.com/new/resource/files/75057608436.pdf In PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/fasonig.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kapekasikijoxoxivuj.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/seduvikarafux.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/bajolug.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aedaea784---reregejadazixuka.pdfIn PDF document text
    • https://majubesar.info/contents//files/muroguguwifipirukorudag.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/48744685352.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf7ee69878---jilotudagewaxasinekamo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rurowomujivevudifi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052014334020.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoejv8o43hno1sftt8kighdh40/ruzadetuv.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/48071639493.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/regogepi.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gakivowuwezunan.pdfIn PDF document text
    • http://flgr.ru/files/files/52034338645.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4njdqs6c60pjjtp45c8tlb7bt0/58699453544.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/37625127092.pdfIn PDF document text
    • http://beta-rc.com/upload/files/20077133328.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707df61b43e---70237221414.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cbe0c8683---nunirezuzubobirosezabi.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/fupamubo.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/46146752292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+biscoff+cheesecakePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 17440 bytes
SHA-256: 0c861e01611a4363be419998bad8f9686e8b52e03143f35024f1de18ab28859f
font_01_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 10416 bytes
SHA-256: eafd7875422f3b2ad6168a5d3da976b563e79f90e489b2afe771d6eb72f9df56
font_02_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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