Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3f9aaf4ab7f0db…

MALICIOUS

PDF

87.0 KB Created: 2021-10-10 15:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6184d3baed375b84ce5d3ebeabbd93fe SHA-1: 56e7956be27aa38af51417f62a79c4ba6594d14f SHA-256: 9c3f9aaf4ab7f0dbe7d40ae1e52ba1ebaddd3881e72755ae9cb98e07038ad4fe
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 websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://queure.ru/uplcv?utm_term=o+reilly+introduction+to+machine+learning+with+python+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/148b555d8ee73f22afebe97c45d37568/49162913327.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d5bd4663---kotitupuderujitilonuw.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/5988004156.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79642893044.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/numiwagiboxib.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/21324174506.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/gipuwifagaf.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/488513473.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/dukogi.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/18266499636.pdfIn PDF document text
    • http://topstec.com/d/files/gatarevojunaribuxa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a5a71aa---gududidalijafup.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/velixazozesoxik.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/49466208164.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202110091059264191.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gubevaboke.pdfIn PDF document text
    • http://opersan.com/file/zixowevibigasope.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/babaxodovudisajuripejew.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/44954576026.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/15986338269.pdfIn PDF document text
    • http://erimti.com/userfiles/file/615340711.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/dikodigemodusona.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/14528309725.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/74524231132.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/36741503107.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/50415343041.pdfIn PDF document text
    • 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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 19624 bytes
SHA-256: 80ba6706c1e16295c40a2459b4248ca26c60e91a030fde7c073c1e12f46aa7fe
font_01_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 11224 bytes
SHA-256: 8ff83a2df76ffb484b712401ffbde2f3d8d57083aaa6184bc75ab79ad1fe0ab7
font_02_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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