Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b79464b189c1021…

MALICIOUS

PDF

108.4 KB Created: 2021-07-16 01:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 257f5c24cdd18de5efa4e148e7247699 SHA-1: d31e62ee4e7aa27732b15d414f20f095c606068f SHA-256: 9b79464b189c10219208d4f0ceadbcc9512536e4b305e2f912aa16143604af52
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. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mayxaydungthienlong.com/uploads/files/files/xijenidawevobiton.pdf In PDF document text
    • http://www.aqsclimited.com/EditorImages/file/63761273833.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1ba94d36---vakibofuxonenive.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/66807013960.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc2c4774a---31835716191.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f68eecf---65453956543.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/23f5b9ba312d21e113c8124adc0906fd/sodubogoguvafode.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/peratarixivujuzovigonufas.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/50818068703.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifi04sp5rupmoojavcne8ned4r/pibisisuwefogipekowejatar.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4u8janosjcc86gkmn5rr41k9ic/rimusorizolejususuxozew.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2eq0u792bceekb74ds80242937/makol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df76b6813.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bekagofovipin.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060710151173499.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/82b6ea722c73f1e3e1ec2a15a108061a/8058661200.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/46201184005.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c5fc886b5357c036660fd8a9fd893271/624740176.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9u2ifrpicvll726ch5jdha2e3s/53165562828.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/paropisikoxide.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39626cbe0dbaa5be9114d96004b611bc/36951279603.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e00d62746---39411616269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aristophanes+plays+listPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 16944 bytes
SHA-256: 0e833b29ad203ed41db644ab16c27de9783d34eea91bafb5c37fbce7f06b7b92
font_01_sfnt_off0001734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B66 10444 bytes
SHA-256: f3163ddf82f24e654dde984a5563b2ce45c6acf4b1fb6c0cc4e55398ae00d3a0

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