Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e2c5527f491a5c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-30 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f278fa6754eb3bf5d9af7bfa9d216103 SHA-1: 07bfa28736a12c2f2b4c69e0dc184c2e47fe720b SHA-256: 33e2c5527f491a5c086bb4c4aa366d36f518e49289bc422c0294dfd3baeeb19e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into downloading the embedded PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://buddhavehicle.com/userfiles/file/3126433591.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/vopinizimizebiriwazatisiz.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78fc7acc5f---30218581515.pdf
    • https://bem-sa.com/img/file/vobazale.pdf
    • http://salkim.com/userfiles/file/81335417443.pdf
    • http://wintec-samu.hu/uploads/files/koxexibobemamex.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59e5ce92f---kisix.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0e5a7940---vebunanejokuzesowono.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608112f120db8---82228750152.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/65527fe1babd7065454ce2a5be4de791/xuvuguxefezijeriv.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084381c203a6---rimonefesifamebunap.pdf
    • https://aawyx.com/sites/default/imageuser/file/naxakovisiwebila.pdf
    • http://planbmedia.hu/files/38949424080.pdf
    • http://wsp.pl/userfiles/file/nazokevidavurajar.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1c5733d131bc5b2c2740c75d5635abe4/7535039253.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf82d9fb2---75951614528.pdf
    • http://younewstoday.com/task/userimages/file/wesusetes.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/busojumogum.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd47655237---papefam.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c754fb362e0---60344117775.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5d2b7c55---gagepolepirinubidazug.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/42549160540.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160890c761deb6---43461090513.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=little+brother+brewing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF49 16792 bytes
font_01_sfnt_off0000d760.bin
f845bb311c69dd555ff1065d2c0a47004ba0b871b885e13cc3d4aa9226f0c03c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10240 bytes
font_02_sfnt_off0000ee4b.bin
da26e00ec2477b9ba60ba9fb69e814c049b62c60f6c6f651cce226f7cf8401f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 17092 bytes