Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a90a1b5ff9661f…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 916b9489553a12f7e836e744d838a69a SHA-1: 2efe432f13d180f24b20bd896a450deaa46a1bdd SHA-256: f2a90a1b5ff9661f4daadc671573fccd6fa70d262692ca9385b314f0bfec2354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=truecaller+mod+gold+apk PDF link annotation
    • https://igraonica.me/userfiles/file/pipuluginopovasopakikul.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/53609646811.pdfIn PDF document text
    • http://glttek.com/userfiles/file/lelirexavakabu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/49878754219.pdfIn PDF document text
    • http://sarvodurys.com/userfiles/file/gevufelesazepa.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/defatata.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/bozelozunu.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/gujiledubu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8e2181a99afa5f7505838862b33db6bf/93132384856.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/83566673966.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/77591948716.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/bopaduzowatepiwibomutopos.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/xazesaxomibonibupuwipa.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/26405099571.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/12320434522.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fd42f26c---tibug.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/feloroxujejej.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/tolinikigudipamika.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/99220068578.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/sujogifufikunalijoga.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/mebigen.pdfIn PDF document text
    • http://195exim.com/datas/files/dugixobeti.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d6386e71---dotizobotofevaxutorozuwiw.pdfIn PDF document text
    • https://btegypt.com/file/71802092627.pdfIn PDF document text
    • https://superchills.com/userfiles/file/67104943009.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_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 10548 bytes
SHA-256: 0f77ae647e509e4b37c236a9f1f2d018bdaaaac0271d9c1a5bcffe0283ea1e46
font_02_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 18852 bytes
SHA-256: dc4ad21af2b0f6b8f8c67129b35fc2aeeefa0d414373e76b1c18a0c23bc4b810

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