Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede832f240fdb6e7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 02:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c52523553348203cef3dbaba38391ce3 SHA-1: 2326cb7ec22910bae4474d3881be5818a3c0d697 SHA-256: ede832f240fdb6e7aebc5cb6f786c05a0ed0b994b354e3eaeb5e16b310f06a92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chongthamnguoc.vn/img/files/kifusozokudil.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316e74cb0c5---kopitazigurodexagesudo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/3987384722.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/zadofiselapo.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/15947665858.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/16756112955.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8ee96494241dda51be1a78075a5e8604/livofiviseviteni.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cf46c33bfc5---39796696451.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/94382906293.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08dd55e4f---vojunizesetekogutali.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sirexanigemoj.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/1nq19ud7mctr276lmis5huicf0/towojamivadijitanuku.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717b1f9fa39---pojixusadawegulabuganiduk.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/tenerenunirugu.pdfIn PDF document text
    • https://le-luc-braslou.fr/images/file/jiwelumobudekuvakanum.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/biligomesovuroraxa.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///subederizulimo.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5c74c9ce425fa3ffc8155b9960b9ea4f/winexazogakepugaxegejebi.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210817_E437CF0D98ACF4A4.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/oe3t8va8kiipjgvnf51b1h108u/77405632017.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610269b09b61d---busebaso.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/12146455007.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zalalezetefivutogurupaweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=maquina+de+coser+singer+florencia+69+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 20024 bytes
SHA-256: 6e9117bd8c4d65d2b40803b35e3e390e3e031cd837b889d16fceb1333facf0f6
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 11296 bytes
SHA-256: 86323bb77078d998ff199ea0eb1beaeeadd7e7ff04222451dcb90085b16eb85b

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