Malicious PDF — malware analysis report

Static analysis result for SHA-256 333142c822af7e6a…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 05:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f251a508d90d9680c611da0b88007bd5 SHA-1: ab0eef5d75223159a303963bdaad3ebe433f2102 SHA-256: 333142c822af7e6a72009761a49c13358f0c200bf6aac7b6b3e461ab8b5136a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ouhkpthaa.org/userfiles/53454004013.pdf In PDF document text
    • http://stillincontact.com/images/mails/file/vujikesipovewovezeridef.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c0125299---39972737849.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62837e7aa---59881342311.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/61426104335.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fadovurevifexi.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/bixix.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/kiselugu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bffd92ff5---rokodolonuninedotogirono.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/43966190003.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/89684510126.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/zonitazorotezefojulox.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/robatefovokiru.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/gakoremefixetab.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6a42bbaa---fagoxaroxusaxudomojiluge.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/xumopusubezatofenasofizox.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/47198735286.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/bazofe.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/26543109494.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161329345eab61---wagufazuxilasugazub.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/657519a191e4fb2ee874fe669d91fb37/23701247265.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/rokulevasavowesina.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5f7e00cc---28859574892.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5o57qcmsrk3o4do83nt42mvs0v/vemedofawugijedanu.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/79057769955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=como+convertir+archivos+pdf+a+excel+gratisPDF 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_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 11264 bytes
SHA-256: 7de9fe57d23927a53232b1d1910d45b9008f5909f3bbf0ce44afb9c7e82f5452
font_01_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 18960 bytes
SHA-256: 83197389118e30073fd81aad22df068a75c25ea31a5a1dbeddf73a3c197fe65e

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