Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a2f025a05a7374…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 04:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfdf74932018488bde64d598264c0e58 SHA-1: c3a9a3d8b556be5951ab9d6c82b6ca7e0fdfc313 SHA-256: 34a2f025a05a7374da9c6d1062b4b35707a5ccb7284b78336baae43af5b500fb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chinese-wall.tw/upload/files/gikezeturixiwopeta.pdf In PDF document text
    • https://majubesar.info/contents//files/55703292921.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cc63a3c6b499c3567b0b2a4dcac9d946/88253521005.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/ponogelolitojobegurimabo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3cbrqb8nio3bfn0p2n0kuh4u12/13242881055.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/97946384712.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c33b94f3---gusazep.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/22124762691.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f73a5c1bc3d---tokiwiwitebadijil.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/tolaworemakewulow.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/95545339905.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/59laduiiq0b3ratqi6fnnmnkv1/27799982412.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c7220212c47f49868d9f014d9bf6c39/bewifevadepanodekamevus.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dndgv82th4stdtfpmdmhplqckd/94146306008.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48336ab35c---simonuzoxoxuwowoses.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/kufedopob.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5hvka1ffm32hm5k980jjb65icn/figuxubifikoxabunano.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/4964240664.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2ac9523db832c7bc5776010cd100a586/23721971059.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2f398526d02e67e764078f3a8c617e3c/welif.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/53038324077.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/82697334776.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/82008898363.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fdfe259e7---24810328743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=which+or+whatPDF 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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 9956 bytes
SHA-256: 6b5ec87b7fad74dabc0961304c6590699780df70adafa7d23e86d7a826fa2346
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 18728 bytes
SHA-256: 227fe32b7c5f674afd3c9211a6283d616da54ba8fed98b9063f13f547bebdcaf

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