Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a13a075f007b9a0…

MALICIOUS

PDF

97.1 KB Created: 2021-08-11 12:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 189acb418e9649776cb2017c91a01929 SHA-1: bb2ae6c8ba3c6c6a23e106ac777bbe32721a9810 SHA-256: 7a13a075f007b9a0c3200fa59c2f6416ead036daf3fb2eafefabe6e5ad1332e1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bg9rne9ikbknqh5a3kvr495dks/nefex.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/46302562699.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/juwobevepaserukivatidok.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zinemozinefano.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608091507c2b0---94528246222.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/97408881783.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821e34d1dd6---tepos.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/kerajakavibesoboxavoka.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608243e807206---repufowulusegizawov.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e48b1ced---96300691377.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/85324117505.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7f8eaa3a---waporagokat.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/18040520107.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/42264715209.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/389809468801662ede89cdff3b0ab051/81769515325.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/58528991328.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/77439356589.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5a4b5daad583320e1d1a80480bb5d030/9439126470.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/67fa4e451595db6b94a2009b352ba1c6/93788520761.pdfIn PDF document text
    • http://zuche0551.com/upload/file/5466001133.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757f8656039---95887288664.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcfe5c458d---vewoj.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/1609924269.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xolixarovixagekazazusit.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/88160762299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=comparaci%C3%B3n+de+alternativas+con+vidas+%C3%BAtiles+iguales+ejemplosPDF 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_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 18544 bytes
SHA-256: 302900241c4bc68d816e4bf06444c7d80d021fae2881c1c49ac903aef0508e1a
font_01_sfnt_off00013fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DE 11440 bytes
SHA-256: ff65684192e422f45e77746dfbd4d6ed89bce63ea58c553602f29feb5679197f