Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb1b4aedf251826…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 14:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87075b09e3132302871bca3f7b7f2ff5 SHA-1: 4a00363d0d9352dcf4d17ae6e6224c3ba78816fe SHA-256: 3cb1b4aedf251826172397c3a244a53d904260e95a1cd907b281e30f6900382f
156 Risk Score

Malware Insights

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

This PDF 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 sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=mudrarakshasa+in+malayalam+pdf PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f042a791b4b---92149563342.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/gevurorujupuvoxatik.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977cb934226---33759623179.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fudewamujusokilejexipasox.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/sosolirodo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60a582bf9---64128897029.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bd6210fe---90708456459.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db0332e69---wotuxejuvozuxazax.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0bd0087f09d307482fe8870868c63ed3/41270216120.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37954619000.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160844676c68f4---lenuvonun.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/85342974680.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4fed6c34d1a4bdc09d8898e74896d084/nenubiwamiboxud.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/41822237056.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/pilasusijusupudomez.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/491362006.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d1a0d51f---berorebunorajadirow.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d636117278c---90257910972.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/tovigugutupe.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/badodivekadunutub.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/956799424.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/mozaf.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/juwapulugu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/28834177245.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834ac839c3d---323690680.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 10712 bytes
SHA-256: 8716b32732efdbd0e241404d16cf20caa6d096fc33f63a5ecd99e91ad94d672d
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 19428 bytes
SHA-256: 5545d2aba221cc5b083c4695df9e14a846e0af470246430352edc56edb96e3c7

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