Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639386e43c8c684…

MALICIOUS

PDF

79.2 KB Created: 2021-07-01 15:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67b171320e91f65820086268462f87c6 SHA-1: f943d015f38bfdbc5991b223e0deca2b1154b404 SHA-256: 2639386e43c8c684200cde61c0118b1bbb9fbd9be780ab8dddb77e035b1adbe1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The use of 'utm_term' in URLs suggests a tracking mechanism for user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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=bash+guide+for+beginners+pdf PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ih6im1vi8338o6potadfj12k86/bozibikazimakujasojox.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5aivlmpb693p6cielf6oljn08k/lovewopokiluwevotiwuliza.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cb27435d---jotadopijemovumizabag.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18177ba607---34648717297.pdfIn PDF document text
    • http://honda-vo.com/upload/file/25199481401.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/deromujanujop.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/3559058612.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e26a03590---72772500666.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ctoua976b1i7eeqk5v95u0v66j/78749657852.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fsri12o6rfgafb5q0q9uc6scgl/xujurapaza.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rilomaladipudonokofebi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/10639523684.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/369f29b28237882979a8b3f9f814323e/wubuf.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/54687268639.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/ziniludusejet.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/goxusazusabenezi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074b959ebbea---30913435009.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vikotosuwowopuvirerir.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ljfft0q1c35tb4tt8d7ebt8mg5/61051795840.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/dobobesinefimoz.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9aa6e1e90a97426272671df80a02452b/zazibujedotenugidesur.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/39bcc2331147abcccb7c0237562153d7/75068486487.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/34224000668.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798e8c7db30---71744434874.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/74413282674.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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 10924 bytes
SHA-256: 5820fdb0e0299147f6fd5b582e8d28aca951125dfacbb594725e5ca375fb9ff4
font_02_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 18940 bytes
SHA-256: 1d08dcba823c40cc8b0d95f9e1620061a1dd8fd60df86392732aef20b105f3b3

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