Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3b57de0f1b185a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 06:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4716327ca95821cda93d53cc8a19e08 SHA-1: 49e634ad5c3c89da3d63e58c666a1e737ec6dc64 SHA-256: 9f3b57de0f1b185ae0fe8bbd6b46b675104e27d1eb61418a7187ea03e2f0cb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall structure suggest a phishing or malware distribution attempt, likely leveraging embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=cloud+computing+concepts+technology+%26+architecture+thomas+erl+pdf+download PDF link annotation
    • https://elmawadah.com/userfiles/file/deduditexed.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4e7ca12bbc59497c8cbaa7dbd4de18f5/vovidofanixixaxixuxux.pdfIn PDF document text
    • http://taociren.com/upload/file/210722061208219377sf4bxsxxlbc5.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rq2uq0ac5fpj8msbpu9649d567/vusunafevejoxukagek.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hl1fcs4o5ek4jdhlc61tbkucfe/gusanulidafelase.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/33c2c7c8df5d7ded253a9d2185285875/89748047177.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/pokof.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/jikesisowesetidomobuso.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/70716811105.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/15956709250.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ef4ad1d---vedifigis.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/tinimaforojekezo.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/fekijomixaninepizuri.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/nalenatadoli.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/pagurunupegej.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kururaximig.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/ximurozefegunigebijoj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160767e2dd0b90---mexoku.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/757bac3c15e558773bf867cf9a233524/valep.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/51814914734.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/tuwebuzosuxegojobinafap.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210810_085549_134.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/duwik.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/74703525903.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/231adae4f6ae5d5e4e4d85f7ab72a22a/xezafegojefitoxol.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/bibutenejuvebuluboza.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e19338428f0df436b607471b6d78e230/55853306973.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_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 10944 bytes
SHA-256: 6887e638140c71153935e5b50964c906653b22776f533dcb8b52997e8dccfcfd
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 17720 bytes
SHA-256: 3989fc55357bddc40daecbec8c55f1511a903a462fe590090553c1cf25b0fc2f
font_02_sfnt_off00012edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.