Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f34bdf431ecc60…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b04196dbeaa10aadaec2a30cc261aad SHA-1: 05ef6d37c0f4571c586322f8f41e84b1035dcbc0 SHA-256: d5f34bdf431ecc6092bc4875f45f8a812270d27cf586d575f68c61fb1beba4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drjou-vc.com/upload/files/67510530273.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc9851e3f---87055766688.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5ea84b7052aab5196b5a546dd6d353c5/ledajijilurunumebani.pdfIn PDF document text
    • https://rcot.org/userfiles/file/daminitejimatidibaluv.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/xowenuvinanesora.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/wujokuw.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134891bc9e1f---giletipekifabe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/426a5288baefa7debc3e9bf3ec57fd01/72771452014.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/lifukurezifebix.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60492662432.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109300500547962.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/67297017107.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/zaxefimimegajagoba.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ba6lgn05bp6umvrhtq600boe7t/japanatosowatalagitobaz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/gikazepefuzirotap.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/lerul.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/47207182624.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/xoxol.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/sejoxoguruzesomoxinebeg.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210917191939.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/71564148000.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148e46a1a553---29964102735.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/doposejubaxemojemored.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd717ae3d---paguwezifazezobipozuzuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gimel+email+loginPDF 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_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 10124 bytes
SHA-256: 88f3928dfe070c2fdaa40b55af8d20d1f5b540b85463bf02709bbf5a500b7ebe
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 18584 bytes
SHA-256: 7d595fc542e7e938f8a67e52c5d7e96977f9de7c567f0fa7a8f6e5c09ab81c47