Malicious PDF — malware analysis report

Static analysis result for SHA-256 a518130db90e9f61…

MALICIOUS

PDF

74.7 KB Created: 2021-08-08 20:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 370b89b28b2258829d74309f53e508b7 SHA-1: 3d537a28270ad2782d100f9118f420d3087d526b SHA-256: a518130db90e9f61c9c509286492e45edb03e40354ca9891b6a76d578eace9e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=cornell+operations+management+certificate PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ffec8990---bitomebanuxivojisezere.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/suwibir.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/91426911821.pdfIn PDF document text
    • https://ekransamara.ru/files/21650978784.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/1476856289.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9e5d7b50---72052505265.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/97213631502.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/zumitijudixux.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/zegowobapevudevuvuraxe.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/85bf624f651aa0fff2633fea2c38df0b/57625870264.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/22803366530.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc08a380607---68589107332.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/futif.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2b73ae99b15f615aa1f2154dd033af82/31329316045.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7b7f452---zufur.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5d3dad65---bupafavumolofabavutupi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h09p04rdrp905aocop859b8dl1/23420195271.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/23477310101.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/81617044695.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a160cac59ff---jezulo.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zidawikaxi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9ed1044d---povugewepejolawegixofuvam.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/59463808789.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/pufurorinajefodumuragaz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f2c99698---21310612848.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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 15960 bytes
SHA-256: e4536374b2cca5449d9525e02e0003263546d8eb604fce660c1d9753d844b458
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10852 bytes
SHA-256: 7e1c5bfbc690a4f1726de8a267a41731d19ce5827c9da8c98d8d859f74138e0d

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