Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7c472ed813ae00…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 08:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c25d0b2127c6b2386fa14353e52204a6 SHA-1: 0377549f40512c0d6919b72075b55635d04519a7 SHA-256: 3f7c472ed813ae00c91ed4c0a02a05017f94f44507de2048fbb2b49ad0f4f535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload directories. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bogaarchitetti.it/userfiles/files/35620857132.pdf In PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/76451126157.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/poxogomivuguzexamomasu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f295a3ab5---tupejusumoxu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9e64c2138bba867444bd9045b52c737b/67562241354.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a8jqrm9i6tjvvevpu93akhp5k5/99914768082.pdfIn PDF document text
    • https://rajaunited.com/contents//files/fuwalu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/88909170709.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fixiki.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8f4f1fcc048daeca757306c187c215f0/929055483.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0301820bb4---dapir.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/370a53574c20414691c08d63273dfdb8/webugetugit.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42a84b7b6fae9dba20ced1e7461bab9a/63826311375.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a0b2f3b3---59141089371.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/32008857053.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e601dee263495d93462ca80f01597871/rurexiligipiwe.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/watogukenevofifiwasuwa.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/kafejilifarapufofa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/luxukumodozagezek.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/ninadigipazufawu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9995o8gtfb5g282csmmj2v5onh/zixalu.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/67082509100.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/ropuzajitofunetabebojis.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luzapesibil.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/40808216111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=harwichport+for+salePDF 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 15080 bytes
SHA-256: 6bd52c573c43fbee3a4f5b6add24d3e875184552b67a52593a716fbcb803abf2
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10552 bytes
SHA-256: c485122a6c180dfdd80dc181fff2279829bde1f5a8aa6b182941e4443879f92f
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1