Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28f5de8f185bfb1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc08dec39fb2759fa064ed542667aa2d SHA-1: 39121fb88d36c655474b79454cd35f445f1c632b SHA-256: e28f5de8f185bfb12639d4e07a4500d0a3846c542eec9955ab7d0067e6b40021
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 websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://urologasdainys.lt/userfiles/file/77526489222.pdf In PDF document text
    • https://beldapin.com/calisma2/files/uploads/pigixeduvopiri.pdfIn PDF document text
    • http://planbmedia.hu/files/19034763392.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bugul.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1a748182---nopudadomejele.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/5960070066.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ijdg8m1d6hhje2k05dlakjqba4/zabojelidi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cb21290b31943b771d87d7dd6a25287/17426004112.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329e32949e5---xitona.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/devobeligeju.pdfIn PDF document text
    • http://raczcsalad.hu/files/10669191696.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/fapex.pdfIn PDF document text
    • https://shunnasato.com/lokanizebaresomulotata.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/kiwumujenekefe.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/dakazosupabawezusazot.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/gerarejusaxupigulonifilo.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/34479321667.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/59436465695.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/8953627767.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/badiwerivuvu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/lowetipexujobokako.pdfIn PDF document text
    • http://hla.vn/upload/files/suwinufuluxutirefuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+game+ctr+for+android+apkPDF 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_off0000b05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05F 10972 bytes
SHA-256: 11c26ee584e03d57057c6828efb2828faaf4d02dcfcdd6d0d26306b852e5624b
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 14864 bytes
SHA-256: c3bf7499884a4233449569ba590a6e362ce922caaa505bac27ca8524f149bdf3
font_02_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1