Malicious PDF — malware analysis report

Static analysis result for SHA-256 657f6580a0d659d9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8f62366e63fabee254c860c22b88d55 SHA-1: f417d49b0a98eaf682417d41f4d0a1fffc52ef06 SHA-256: 657f6580a0d659d941e9aadeef1ff85a5541b4c2141fac8f6d1a010d7ed30d6b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://studioambienteterritorio.it/userfiles/files/43477154330.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tjtru4rfrraeeqcobii14tgd6b/bazowefatopolimoxise.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/lokine.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/31099a48cf36f191858d01918d2ee4b1/33774783723.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108bee4e15f5---43639001382.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/luketijufiwiton.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1280298358.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/79130087375.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2e0e66bd---zabawageretiro.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wizowamamukawu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gr0278igpclko86l4teksmr6ep/tufalivapomid.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/13390319469.pdfIn PDF document text
    • https://coluer.ir/documents/file/vorunu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42072820991.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/nexudowu.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/mezadifurexasokufe.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/wivab.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/bopozitejadasekivafemu.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/weditimawiz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611aea7daa423---36903424175.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/34197855520.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3d92d247c2ffeab95b1624163b7e6e63/zerinesemulo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f37ed593008145870fbf40b534f540f/xuxesakewororidifoxupajuk.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/negakinuf.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094519774c77---xajipagepib.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1206c517---76064502287.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/63935933630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+and+maths+degreePDF 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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 10672 bytes
SHA-256: 7f8ed3df1a4029463d23c412d6df9a00df2b06e604cc24d6683bcf3e68c3cdf9
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 16228 bytes
SHA-256: 76c62a71f855278a157a26b0506112ede7f590691d37967af06ff7e7b3a15e15
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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