Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0f26c63069b0c0…

MALICIOUS

PDF

91.2 KB Created: 2021-10-06 03:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9474186e87bb0f952c7ace37cafcd3bb SHA-1: d97e3e477511986158ffee6a50a5c07352ac639a SHA-256: 5e0f26c63069b0c0217c5b2a034e47b8f49b131e32ea83aa9aa804384ddb1c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://hbaoge.com/upload/files/jurofupadafowow.pdf In PDF document text
    • http://petra-koparki.pl/Upload/file/32467300773.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615207c32868a---22302086281.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/31045616851.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/42ru11due75thledta2ok0ndr3/79800410642.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/25124244425.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/wekeperalomabutapiwe.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/5369833173.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/buwapowokavo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/79630580857.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/87103123640.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/gatojejafirenedir.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36411357894.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/40097141354.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a583a3005---rozexuzokowiwopovopos.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/segufekabikiwapabadep.pdfIn PDF document text
    • https://aspirans.com/files/file/26708404085.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/77524477491.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/saxevurelomepo.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/petomo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615876888e6cb---6760427990.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/74466571251.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d5664fc6d---25595339131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rent+control+policies+tend+to+causePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012ae8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AE8 17732 bytes
SHA-256: 0e19d1821343d93fd1ff15a6e4715aece49b7d88fe51018c80733b074c0e7298
font_00_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 18332 bytes
SHA-256: 1273c510032bf3530b3c1c29b55ba6a0a270049ba64891c4edea69db8cf79224
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 10652 bytes
SHA-256: f026c23e0d129ec30be8badabb8c1ad2a1c38a319fc07d3970c2afb9777fcadf

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