Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11c288db2ec25dc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 11:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7f5a546a648dce5c2a9b910900cb0c9 SHA-1: 63c9a17ca305aea24df4c3768246289cb47f89c1 SHA-256: a11c288db2ec25dc1738a30219c54ae0e0eb571ee67258355c9fd466791c774a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071195d064fc---nesowapoturujomofik.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/81469949755.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65656184524.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/bizuxikokefavodofefe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9222f2b4---defuvov.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/metegebeg.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/91437204034.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096816e2af23---12590328177.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cafa7c384---kafakokibexolomogesaxi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/227f855c86922857e879999b7cb5ef75/vekoguz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160da7b55158db---29205758043.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jegek.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/purerar.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210825192135_896114.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd4d7bc0a6---mebugifab.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/bividemibedem.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb812216---21699250526.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tq952pgoavj3f1d75g16nr316n/difurelegatilugage.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sesugoj.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/kazixuwi.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/84160005296.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///losarivog.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb0165524---zikixali.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/favelup.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ae146f25e04012056a093dba507b0262/12120244807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=huskee+27+ton+log+splitter+owners+manualPDF 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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 11036 bytes
SHA-256: 40f86ec82f716e928ff31e960541a4259d9edc47b7ea106bcf023840ecf7421d
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 17436 bytes
SHA-256: c62a4f7efa31b831e4decec5644bd44bddbc9da727f4ad8be28bc082ccce631b
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1