Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3af95a64af52c5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 14:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d82e96e7f8981a1a6107b7d18b42a8b SHA-1: 8341d1398b75e16651ef869a75ddc44668a93cc8 SHA-256: 7e3af95a64af52c5f7b852472204d93dbd353a3e3e416872d9d4313560f57603
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=arihant+banking+awareness+book+pdf+download PDF link annotation
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d77c22602fcb1113fb129afe1ccc44e1/laxobasaguwanunigib.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hd7s8b4ege376o83aol066m9gb/vididebifinumaxedaxali.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dotos.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c1c2ccbfa096b86232358eef1e4be40b/batuwedemufo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160984a87dbe4b---6758202396.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160decf9abbc16---faxujebatemilasisabonibi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607036afb5b5a---79935561617.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/fumoxepuv.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/943157785.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a4ea5a34df3bbcd7ff3c080f80f12e34/41951163744.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/36493864626.pdfIn PDF document text
    • https://abeess.com/userfiles/file/21355402074.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fa4ee727---74897680176.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/6897418909.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/33963765008.pdfIn PDF document text
    • https://dalba.net/other_files/File/39035170870.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1186232a9dd47e0bc8ebcdc76f3a7eae/modizonuwosoferomiwasi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nomaduzikexideximafux.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293100dce3a---32043835055.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/69977608235.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gefetibikibofix.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14e00e233---kixesis.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/codjg0tinabbbf40ba5f5um3v6/nopazixemo.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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 21564 bytes
SHA-256: d923bf73822b893911a898f3dfd5d2b719bd622357234d083005c8e0844dcae2
font_02_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 11076 bytes
SHA-256: 080ef1d02f19db9f6e3d2c4cf14826179be62ddb972a4e5e992fc92468992e73

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