Malicious PDF — malware analysis report

Static analysis result for SHA-256 9602176bf2697836…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7878d7ea5cbc8155e062ad48168996d1 SHA-1: 3d0dee542f1242e6c1323bc465f9516435a7eb7f SHA-256: 9602176bf26978367da5930c916c0e87332ef012cece97b6144290182f4ca5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ost-fogging.com/upload/files/43620789701.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeba401750---42506189736.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843faca276e---61058417316.pdfIn PDF document text
    • http://elise.pe/images/file/zoboruxedovozorumojade.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c178ce33---mifaxowixenonesun.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e4a72f14---49549347929.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/48765909451.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612153fb1891f---jexefunewijuxipokumavuku.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8fbqc5npbr21qkm8j32pi676je/jilebijemulugepajo.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210721_84906DE888475C08.pdfIn PDF document text
    • http://voijin.com/userfiles/files/fawiwuwimuvof.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/wonuvidenabudutoruz.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fb93727d---39570261616.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de14eee0328---tojusoride.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2613cda33f---gajurasajozamezodeka.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3ef49617ea1413600c79368c5af0e421/wajasokepe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4e2a763ceea7cdcb975aaca7bc2ad503/rugisesuxarod.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf87673bea---mifixozosepusudurekugu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/63349595458.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2984c396ff79c861cafcdfaa1a9e4af1/5527559965.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b69adba87f3---wufita.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/23738636442.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f84546edd933747271629ca80947635f/numadujewonunodazo.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/77951108614.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/go8tqa22ipc09gc34vi61fd4ku/nigizokojanijapoket.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b80b50b7a61955e42a853dfbd73657b1/40558192607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=duly+meaning+in+teluguPDF 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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 10276 bytes
SHA-256: 9f7a67869f21d8508586d2f3d1418020e4d411b2d3be7c604dfe99d1abe533a0
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 20396 bytes
SHA-256: cc042a1a78161e274c358e8ca9f3572951d8f544b676eef637cf0b00968c7410
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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