Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc61fc83f26ad49…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 11:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f82e474bb7d290f7caa2bdfe44dfb29 SHA-1: d7aa1f053d4e61f1899acee5a47697ab8e8e9ee8 SHA-256: 5bc61fc83f26ad490004bd269001ebf1e77bb79b38e498ba14770345e6362f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://el-master.ru/userfiles/file/19119497088.pdf In PDF document text
    • http://autowassenindex.nl/images/uploads/jakuxubufomi.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/pofobukibodino.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/78946168959.pdfIn PDF document text
    • http://askort.pl/Upload/file/87737873223.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ebc8d30d816d79609a58982c0bec7760/70321331654.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/tazejowiwinukunuvezamozol.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108100341567980.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/bevifexofi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ca7ea046---ronuz.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/puvaruluzusofefixerovod.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/kavowexilamixatorejikus.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/maropamuwubobikuremi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/46tmnpgnjdbit3dq0q8bl538nm/99320679138.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/52matajt4msa2d9n81ro0kuc1h/votofolukenilo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/20674182522.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/totiboposajozixagav.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9ce0d2e0f86f23d22f6a2091978b941b/wumusegufesemop.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/74055505717.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/74190432322.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611742f5074e9---bilonuvelivepinat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=new+manual+of+homoeopathic+materia+medica+and+repertoryPDF 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_off0000be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE21 17620 bytes
SHA-256: eaf92e79911fad21b56e574a6b67487f39f5a08777ed529583fac09f8a02221d
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10996 bytes
SHA-256: ac8cc8b0ef7f0331e50bb7bda1b8d1eb03efca4ad72ef68e228810cfdecbb1a3
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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