Malicious PDF — malware analysis report

Static analysis result for SHA-256 d457ae3b78703cb3…

MALICIOUS

PDF

79.2 KB Created: 2021-06-26 06:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f1a2b84a8b3f4e12a9004493168895 SHA-1: d93879e3446d10b46ef2c47ac23557f75de71eac SHA-256: d457ae3b78703cb3e2699a3e142f0864637f8aa27aae793a8f2c11b4bf2d01bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links are the primary indicators of compromise, likely serving as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pistant.ru/uplcv?utm_term=well+she+was+an+american+girl
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6660db3ee1---7666866454.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6420d01c7b---minarezogidasexa.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94432428785.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/powisefuwakamuranakibep.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gvqtb2d412riuvn3b54guao7gn/jonevakumarevazowiti.pdf
    • http://klccpa.com/userfiles/file/23300100253.pdf
    • http://mldinsaat.com/image/files/fisozizabetiwapubedaret.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c54f5b6a724ea0a79ccb6db82a0ac7cd/53696725843.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/32teq05b0ngocccq6qqv9j1sg7/43583706214.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf09be0cb82---pukaxega.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p88g9uqjn8ie06lm5ojiusdklp/bolaj.pdf
    • http://evpltravel.com/xv_image/file/sufolulebujesawuvonozaza.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26ddacd98---wijiduvodef.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1edhh4tb6ap7pevi2sivsvvs2/49602497316.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/r8s3a3jki1adjut6a4dicvoiub/12907609263.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584056e166---lebopenepewutizovisit.pdf
    • https://vildmarksjagt.dk/userfiles/file/50751805498.pdf
    • http://aircond.md/upload_fck/file/xazorod.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/aae8decb550879c5437dd8e117918947/katadexedafeze.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/44c70274f636c9b80fa676eb92d52bc2/4808406600.pdf
    • http://rencontres-icare.org/userfiles/file/dokidomiwizewejekazu.pdf
    • http://stark-tools.ru/images/uploaded/87853428411.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40c.bin
9bbc0c4f11a2df230e942ab3fd93fe05a046b92287bbc6c71a8254274ccfaeaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 17048 bytes
font_01_sfnt_off0000ffe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
font_02_sfnt_off000117f8.bin
6e90187dca569846f9fa7330d0dd55893349a79bae0bc9a138443d500d1f5e57
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10536 bytes