Malicious PDF — malware analysis report

Static analysis result for SHA-256 937695b6eba51512…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 04:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c4dfb86da0cb09ed86ea5dbe37477b3 SHA-1: 0c67cdfcfed2d08f8da1516654d5efdb6c462642 SHA-256: 937695b6eba51512bd1d07134b7d32b444dc985374d51c8ddfc6429f9718c5bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites. These sites appear to host further PDF files, suggesting a chain of redirection possibly leading to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607373db0e288---95370581384.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/40705f6d642a3fde60dbff168994f0b5/giduzixut.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8a6ac31fbf9d926ccbd625620857e36c/lopuwanutixejafis.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/479d165011cb05eddd31fe550e77fc36/48996239317.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160802ac97f0e7---luroxirigikagemetetanepem.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/93613206980.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0ab18af05ba8bbb8decee88d996bdc3b/sanelikekatofixo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f93ceaf582783d864207ad12c1fa4780/sidob.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fffde0c8c---jowibefinowuni.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m6k5pbeahcan339i3mu8ft25vb/vamakijimokepafezid.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8vdj3onlkfgoklfcj6gvmnrhjs/50834908771.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55d05c3be---juxovojidatosa.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3c1799fcb8cc928111a1e58699ae53f0/5318793749.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b4718913e6c86c040f1d2dbdd49f3c1b/48152628738.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d442d38319---dowokos.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846296efa50---97211514728.pdfIn PDF document text
    • https://austarpharma.com/upload/files/numatasal.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/78scjnougp9sda5m3q8fv38kqs/rexezopogabemabe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ad866bf7---dekiwukojakagelabekonujo.pdfIn PDF document text
    • https://faprosid.com/file/fuvulajebu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/17865895202.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/esk18bd00clev0j17nrtri4pg4/20619386666.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vumizivofudajaboku.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xirexukolexebunido.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c842735e87---8979376790.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/fasewifodolupegakinifobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=interesting+things+to+say+about+yourself+in+an+interviewPDF 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_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 19948 bytes
SHA-256: 78e09ad88dc34e1e8dffa69343a6d7099e7ab295c6b9044fbf678dd1daed62a5
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 10952 bytes
SHA-256: bef2b75126873068604c53d53dcc7002b8ee8e7eb705fc7e48e64a8a58084e49
font_02_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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