Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d167bbfbb9357a5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 19:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a11839729f88708cc2f8c1c08e30b01 SHA-1: 309c8f9bbd0c08a2e3647b26b2448aea3a9f11aa SHA-256: 5d167bbfbb9357a5b73998660c623728e2b54dfa81c2d8f868c09816ac82a80d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=demon+slayer+mugen+train+full+movie+download+1080p PDF link annotation
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lutibemixivulexifepef.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/gedawevisojukefase.pdfIn PDF document text
    • https://seerupit.dk/assens/file/96998539561.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/84039277077.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lirakidazinimajumija.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/34459551438.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wizup.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655015bec4---39527616459.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/komesoferorivovavojupa.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/noliwekezaguxelu.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37225558487.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/56333477176.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/vubepitadu.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210909180226.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/fonatatup.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/batewisexojedukegilez.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614365faed2dd---30308157779.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/70791638324.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/41101979583.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/46556498711.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904043733360929.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_255A2ABB85F12BD7.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/29820118166.pdfIn PDF document text
    • https://termoformat.md/img/files/79050500397.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/wujexesav.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/17d1eb04e2d6a75ab1cc4d91b1bf296d/46063731543.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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 11592 bytes
SHA-256: 609ae4f6da236faf637b865faf9a5086d5bebd6a48b57abdeb846c11f3f4dc7e
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 17336 bytes
SHA-256: 3ebdc076cf630c7a1b930bebf74cf01b4ef55d2b56d9877ffb3cf0762364810b