Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebdcf1a788156c6…

MALICIOUS

PDF

108.6 KB Created: 2021-07-30 01:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cb3c3e3f597fd0d9a5bc7e78dc782855 SHA-1: fa8d046be07db68f9c00c4371908834829f9f4a7 SHA-256: 3ebdcf1a788156c6f95967e48a83de3898b6c7412d1f49060142884629149fb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kazekap.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/zasiwelesasugivodobag.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc014b961---50590040512.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/92607923981.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/84984487999.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/331c02011b7511681227340c89d412cc/jawosevojufaf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ddf05765---zawudobusizi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pqcgiade8usnmstan43278rusf/5215397032.pdfIn PDF document text
    • https://mollis.rs//files/puwar.pdfIn PDF document text
    • http://primaneighbors.com/userimages/77312216173.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/43527518314.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59690174319.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8411ef56789874d39f1fe503a3b22aa6/sijaf.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f618f9e4---wugijiwasijasagurabuseg.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/94314173556.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/30625014296.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcoke0hqduik0ukrj7aoi9mlrf/mijosamodepakoti.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rllhkllh4g2l2gl3urmgimcniu/68846130529.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c887c21ce04---lafet.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s7c63uq0qv2q641h1sramc3kkv/65742904637.pdfIn PDF document text
    • http://dentherapia.hu/files/file/lafozuwepile.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/67942859549.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/jepevolugewuparituseluko.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/61766604378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pitru+tarpanam+mantra+in+sanskrit+pdf+downloadPDF 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_off000144d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D1 17268 bytes
SHA-256: 7d3b6cfb0e0ab4ed05311ffc10aefa116f7a15bea8d0df43e65d8a3af6be7040
font_01_sfnt_off0001724e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A65 10808 bytes
SHA-256: 98a4b70aa95d313d6eba55ce01665e4b275c34f49055c3c8ca4740a7f19be157