Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac20e4a76f821145…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 04:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d844e259db88066823ba0eae9ab1647 SHA-1: 944f6179c59ed01a1e00f7fad8b19506282486d5 SHA-256: ac20e4a76f821145daf806008f0a9ecc63ff340a8f8db9c7d41f0bafcb76e68b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple disposable hosting domains and compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ediljolli.com/userfiles/files/25016140555.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133821273748---1100969182.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/70377623527.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/xiratagulesamixidunisetu.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/92019577253.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/gematimav.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/80502528699.pdfIn PDF document text
    • http://chieucoingason.vn/files/71770769169.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/2186776303.pdfIn PDF document text
    • https://rais.bg/uploads/file/44555402720.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/sawegemawonerafisid.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d960b7d58---sofumerovibadisebif.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/19172491761.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/zejidamololaru.pdfIn PDF document text
    • http://alptw.com/images/files/21213721858.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/84544966145.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///netowaku.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/75847924066.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/10797688641.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc214080b8---25431221691.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/wagesebiwuguv.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/45143174956.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/gemufilataxesekamoso.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/jisin.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vololeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=remote+play+pc+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 17548 bytes
SHA-256: e4515c03fbc7b1e449660375a63d706012224348ebc8cd09a0bc1902e5a196e2
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10668 bytes
SHA-256: bb6ee88a7ddf0d66c839191f8cbdd4f6a979bf5f1c362176313b8b05779583c3
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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