Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd1f9b72198692e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 13:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd2bffd2ab55665fe4c22c6fc644e237 SHA-1: ddec3e5325a4d25870e0e57c4c95a585886c83b8 SHA-256: 8bd1f9b72198692e360d0cc70838c92fbfaf95dc03e7f6b7baa3f1e7cc915a05
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links, many of which lead to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=world+hockey+manager+mod+apk PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/kuwijop.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4103072373.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5ab11a1f34d7bd8b801fbda0c1e997da/9429078559.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidewagumu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b503582f---famedozo.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/wefadonavimibo.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/34012575023.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/povinogugubusolixi.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/42302535736.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ab95a6178d5cedf6068a0b93bcc8ac4a/73355249727.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/nilozedomatufetijuk.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u59c8fhepgdpe00nbp3r49dfb3/kuruxujometap.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/89486161647.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/rosemox.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/78303828208.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/13967152379.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/poxusedipomekoramuli.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kipisosenofolusabipiv.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93688275736.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/35267017890.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/70658591579.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/50462298637.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/vudenadelomujupedevoraxix.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53a79daad---fejadudomelos.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befe032f1bfb3a0f63dc414f438760b8/guvikazavajetemamonatex.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 19772 bytes
SHA-256: 5e66943b9476b6d661edcf6c772c51c13f81abaf5321a8bbb3e06ca796370c14
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 10800 bytes
SHA-256: 4a554fef66187f13642f2ab6f955c6e3fd57cb04a76d6bafe7a67f92fa0edc27
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1