Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f54aa2ef7bcf2…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 12:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 694a513d67fb606d36898e1231c6cf88 SHA-1: bcd22a6d6413fbb4c0b40d4796ba0e3d9a7de804 SHA-256: ab3f54aa2ef7bcf2764cb33e1ef44d75aa37dc2aaa6c33fe49c65094cc7599d7
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically targeting upload functionalities. These links are likely used to host further malicious content or phishing pages. The presence of a QR code lure heuristic also suggests an attempt to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37dbc357f---14768658261.pdf In PDF document text
    • https://avistravel.ro/userfiles/file/mimazoxabudorarowitot.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mdcu4k16afi9ebf48cpim75vi3/timegexekunoru.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986f70f35be---83729370480.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0aaf7fe2a0af478810c9fa0f03f3c27c/xukewajikanebalaxo.pdfIn PDF document text
    • https://actorconseil.com/files/file/71614220083.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96b24afd8---kijifanarilux.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a08bc2e83---kurefejusajunefudurudomu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050708351573499.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a76272e2b99236f0a53970c0ee18fe24/vopoji.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e1656813ef1aa726d844b398159bafdd.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/31953231352.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabd57ec42---60406707022.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fibudaxos.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/90334948837.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/10663724138.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bef0ed0c---75243960399.pdfIn PDF document text
    • https://faprosid.com/file/1268683634.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1ncg9o1u38e31g9pv1dprmq1cr/dubub.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/79941675032.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/fuxisatokuneduziwiki.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/48cc0d0a9ac9726f5ec22392b8a69385/dagedazaxakoxeturuxa.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tuxokirev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=solid+edge+2020+2d+draftingPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1aefc12c000c482d3ddf35bb9357b751/mubivebazumizajamiwif.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16772 bytes
SHA-256: 34499fc18bef4bafcd1740d3bc9e39aefd677457f014d1916e453ac00ac194a5
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10680 bytes
SHA-256: dc1f8475fbd761f8f50b3a6f78a6ac2930e571d93712d2bbb9f128e08d97947e
font_02_sfnt_off00013764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1