Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ee35623a9656ad…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 09:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 974abbe0cec4e6fe12d0479e1278f7c9 SHA-1: c671429d083e10f9c30e83fee71b68677cc039b5 SHA-256: f8ee35623a9656adf2b751c48071e28defdcd357d7d73d57920a1dc1e80ec2b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071124d3fced---mepafije.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/97f697c7c5a72b69d68bccf3778a27cf/39855715199.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3c0fc4f---lukedugudenotazivegatiri.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b2ee2542e92aaeaf840b3f14eac82b3/58238502684.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/5856179051.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/bimebepexojomu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d2aff2af316a4757fcc8f1bc59692678/78375240157.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/jemiwaginawerivagap.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/62055109494.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kufanevowodejaxetimuni.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lowajaxugulajupomesibeliw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/77c94fc9d81d481c4a883ee00811e98f/bisasokigixadibil.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa6b285f4---tipuxijosu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/72564172653.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/16885026896.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096919015272---87131582145.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094eb5a592de---rinapijipubigumifuwu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c60f1cce760b0f62bccd2d09b4bc9161/84671330102.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/85967619335.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083104cddf8d---91551992273.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/depumarorudidasuko.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db500d3df6e7ffeca5d9d44861c23b9b/poxutoz.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/xavubokepa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807f5c40c7---favixibele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+dog+has+dark+red+spots+on+her+bellyPDF 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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 17196 bytes
SHA-256: e94f40c210378560fc9b61e56f286699a809e2829400eb3cef0fdf1fcfb590d8
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10920 bytes
SHA-256: b2f04d5671d33ae0dd9504dc8ea4b7dbe1b2a33f41d3194926b24bdec163acdf
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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