Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f14cd71a126c548…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dce6971dd451f6e7b80d56fb48e0a93 SHA-1: ce68146195112ca4ad4ff74349bf0064a719b830 SHA-256: 5f14cd71a126c548be1d9713bd695986f0865bee84024fd67e18fd351bd8df60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://synerhu.ru/uplcv?utm_term=farm+day+village+farming+mod+apk+download PDF link annotation
    • http://cbcom.fr/ressource/site-image/files/89304235371.pdfIn PDF document text
    • https://marosme.ro/hirek/file/xusutupibasanovate.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/jabexap.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/8830860258.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/40357351118.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tiwatenidoleza.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/58042859813.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/99121511041.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5bda8cad7ae5d4f22ab68b7349f83dce/begelilasekunonufar.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1bc3f1b2---48704445132.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bc85892797bcab142ea81daee287d6f/28974406311.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/37244844525.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/635eab446d27a47415de6fc6646b229e/roxupobogowutibe.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914122242.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210901071005.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/69073224003.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/wudomaxagi.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/22681269578.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/xetidejobe.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27228860420.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/12487294657.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613274a4c9bd9---78557439637.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/zazijakomo.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/4947129453.pdfIn PDF document text
    • http://ccadl.com/files/20210911223629.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/kidudozolavegazaw.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339e084f9f---48825420652.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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 18160 bytes
SHA-256: 9a1501e45896ff4083fef628e799ed5b13c490a0f2a0fb64a56dfecf27580c0f
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 10908 bytes
SHA-256: 8e4c33fe5534772f5cdb75aa9ac7ce248d7e5293da9487a831b9417e311caf0c

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