Malicious PDF — malware analysis report

Static analysis result for SHA-256 f385473c6afd2067…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 04:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e81893318e66f27cb400fe91a95fd6fb SHA-1: a7d3f0f84a07ac2723945878b8c191246486f168 SHA-256: f385473c6afd2067442053128dc51b5bf57b5e7152f8d23bcd8c8f815d2d7206
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 websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdf In PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614667f9bbdc1---kezalaz.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109251207427339.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/64206574465.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/boxoguv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb4dfaa0d3---37296874351.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/laluvevuweriranubotu.pdfIn PDF document text
    • http://gibisch.org/files/files/29119726785.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xubonulesu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a22237e8eb5d5a0e23eb393808d852af/87184836809.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/mebigen.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/laribomikufumexalanuzimu.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/48876700534.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/761210315.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/13221749851.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/54126863518.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/suzigukuxupupumefagulak.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/26rm2updgmospimtau33ckuu04/25980338514.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/79300338238.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc23ae67b---winukidejavoxodajid.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/5587196580.pdfIn PDF document text
    • http://naso10.com/userData/board/file/ninosudawiradafirazixibi.pdfIn PDF document text
    • http://ud2-140.com/files/novojedumugakatefez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=excel+macros+on+androidPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 10516 bytes
SHA-256: 1d41c90450342becf939a09f2d10f90b7bdacda2a29bf822e5dbb22ffb478939
font_01_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 16556 bytes
SHA-256: e6e60c0a3829403ff94fdd7c9d6ea8a48b5b47e1138fd9472cca2807a4932ad2
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1