Malicious PDF — malware analysis report

Static analysis result for SHA-256 517e511d8872ebff…

MALICIOUS

PDF

90.0 KB Created: 2021-08-30 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0c8d04aad2f088b5822e53084590497d SHA-1: a94262e554d0f769bfc2a92f85561c15a6b40f07 SHA-256: 517e511d8872ebff2284bc24232ee423431cfba6b1bb457ff9d7109fdaf64feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it is used to host and distribute malicious content. The presence of numerous unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608839dc07327---82130189341.pdf In PDF document text
    • http://studiomanzella.com/userfiles/files/68121801266.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/ferosewuvapofapal.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/35457077810.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a0834683ad835bb619abe8e72cafca71/19927603557.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/90529211385.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/gabamuvobaluzud.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/83430914281.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e484a0e0c9b---10229325543.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/4312568142.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/koxatarojefudad.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610107dd8d95a---81909414527.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/kexonimirodivoziseba.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/1mhhrnekrgjmf3a8fm3r729pka/wemegetiton.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74f8da848---67428623641.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/35925101232.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/wosinadawab.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/rigekigadumufopexaji.pdfIn PDF document text
    • https://cape-electronics.com/media/file/texaluburovajijiso.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/fisob.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/ruduwugajuf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f230089c---32403096484.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bff725d7217ce4cb96f9208b4f98b9b7/2812915082.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/sozajokivenamimeditixakeb.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/84440904539.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01cd2c597---38852461488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wishing+a+doctor+happy+birthdayPDF 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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 19668 bytes
SHA-256: 587bc537e2f3924811a026de90f03dd91900f81d8191bf6039538916b0c1a983
font_01_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 10860 bytes
SHA-256: 24d6ab95fc549679d1d467efbcc39f3ed01aaefb2078c2855cab0f9138217905