Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b30081ec3663779…

MALICIOUS

PDF

82.3 KB Created: 2021-08-22 03:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c04dac58322cc6491fbce3bba266c4b1 SHA-1: 09756ad8c2744af692e2f40bd2245d29bb98802f SHA-256: 6b30081ec3663779a960037e648cd15a3ae327cc09cd7502444bffabeb54e7d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The PDF itself contains no readable content, but the embedded URLs and link farm characteristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dad1e384f---64108941632.pdf In PDF document text
    • https://avistravel.ro/userfiles/file/87366516847.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a51de10f9---71574817823.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b7d4be79c3d8082b197f03391583caa1/52934155581.pdfIn PDF document text
    • https://fallsplat.se/file/tesotopefoxu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/rvt3gmanud85g4scckqb31itk4/gageroduwi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b1563bdf---wejajidapokupalojud.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/67352761334.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d962dd311de---dodabowejuruminoxenorew.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b9bb9f6b0efa6e4ec17570480d56099a/vutagukefabajosevowape.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/direnoxowagazenadow.pdfIn PDF document text
    • https://areicon.com/images/file/3730800070.pdfIn PDF document text
    • http://ruihuitax.com/files/file/bipekijiluvopiwowamelop.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/9ff665e28aa02faa9d52dc8be62791b4/bised.pdfIn PDF document text
    • http://nensi.si/upload/file/rokomibosewasilatirebadug.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/denibonadovuxigadafedig.pdfIn PDF document text
    • http://aa-nusd.jp/rusidagor.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/93617253806.pdfIn PDF document text
    • https://banghenails.com/upload/file/1757286278.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/966da0b546ba68113337a4954935c412/pogupazopubakun.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lakodizikudojub.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4b70fe2a82c9af55d67edafdb070d240/40268249328.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/depogigedunawubub.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7e4df5309c37a6b5a6ad4a3d2b8192a3/46673289223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+in+minecraft+dungeonsPDF 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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16700 bytes
SHA-256: d502ce13a9a5d03cf6618edb59befedc709f5d3a0400296e538b4c68937b8a87
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 10952 bytes
SHA-256: b9fad225d4c26a010782e79002778edd242bfbdc9a0ac9539e270f4508e3daad

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