Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ee2af86f42e1a7…

MALICIOUS

PDF

81.4 KB Created: 2021-07-07 17:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ec1a8aff8eb548de9e0c83531f297bff SHA-1: 3482ad64fe0fd18dc3fdfcafe3d38ab3c5acd98a SHA-256: 38ee2af86f42e1a75afe2ff998356b8a5675b3eb14ae4aac0bd00f929ec13684
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=2k19+wwe+apk+download+for+android PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6619600de4---76021272700.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/45356148169.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1c094baf8822d8acf2dada19124d73d/70318212350.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/51353698420.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/66711818654.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/02efdf785d51aa0fa105b868d9517be8/92512352916.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/degepilakisibitu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5be4bf663f2709d286e4014ef4161f55/zobamofezare.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/lazowonudekavelix.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/30887533954.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fb6e37f533ba07890c86953b49380b26/6184386015.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/42a73c895ad4ad6b171f0a5a4e8a4f10/japubakumiwelaro.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/12911204825.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fivuzotifaranak.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/aef6b9109d8823f9187656255f8b31cb/51885092561.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/26088051721.pdfIn PDF document text
    • http://ruresept.ru/files/file/55977949570.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/95366559631.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c30a3da1a---gexama.pdfIn PDF document text
    • http://boxethai38.com/upload/file/xemut.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf89959c4---zadisowidowepa.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/visesojufafesezotalereji.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d379a25dce623a9bb56182516932ff1c/78851789584.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 17680 bytes
SHA-256: 3912d3bdc50f68ace05dc0ccb0a0a4ee362348ec44f575eb16f12ed8171f30fe
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 10644 bytes
SHA-256: 26af2a4434b4cad7e00826cca46ab76d4161dda431dd9867996aac0f8691b6e3
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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