Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba85a5f2ae2a7942…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d8137f9b7961d1a99ed1738ab5830c1 SHA-1: 00d974eae5026a648557df6f362c076de9bad112 SHA-256: ba85a5f2ae2a7942377ec27bb003e0e50dab2d2bcf7bdc1b185304d7718cc70a
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 CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://drafthe.ru/uplcv?utm_term=free+live+cricket+streaming+app+download PDF link annotation
    • https://www.luxboss.com/ckfinder/userfiles/files/82994630634.pdfIn PDF document text
    • http://boki.hu/editor_up/4866796213.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/94437219809.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dad49eae---17571276394.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109220521536528.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p81ggjkg4h9pt1t8p24o1r1asq/lelunefatokedav.pdfIn PDF document text
    • https://aodaixuan.com/app/webroot/upload/image/files/lokemidetutudat.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/13622172624.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419e63350cf---12182285301.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/67939885655.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/28b1f4b9235c0fe2c7d1603bd2d21524/wujamisuzinixurasoxomideb.pdfIn PDF document text
    • https://magerp.org/upload/files/jusopogakujagovol.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gotajiwinajabefunem.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/87045605436.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/bezidati.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mebidoxubafinaterana.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/io0391uae9362ig66s9epm4jk3/66511636794.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/36510372672.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a5920ca33075f436b2d0d45a967ca283/23657028084.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/57762491625.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/ruwuviteberafunumagup.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_off0000aca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA4 11080 bytes
SHA-256: bb437d47b92a75bf8d0ee510269293f9bbe826fa7b1e2fc9d1419bf25c3cae71
font_01_sfnt_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 14856 bytes
SHA-256: 7c08b34bf6b4ff2154f4c2eab8594ead91f57c3d68cfd73a05d7148aabde5db6