Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f03e46aedcd6aa2…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 21:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7f748f0cf2db4807cd6bd09809619da SHA-1: 42b54902f45264d65c59b2d8749a2292cd380626 SHA-256: 4f03e46aedcd6aa2e17e5ef24218fd9419f2f6a6a7cb69b2a244cfde5cc7adb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=watched+apk+alternative PDF link annotation
    • http://tubemakingmachine.com/uploadfile/files/vuwax.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d915b44b---rufisiradafegujo.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/bozukerubijamusuwajabe.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/37268478005.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/71802077776.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/fujufipib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fc5290bf29ea7ff3567b488ffe4e0e2f/78567833158.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140709b60f5b---43499990422.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/89718906332.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/24227992535.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/fafitisomiwagesokemixo.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///jigurabowux.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210914_E1AEF292B3457046.pdfIn PDF document text
    • https://bselink.com/userfiles/file/80382187061.pdfIn PDF document text
    • https://derfo.info/resimler/files/miduvemimugavova.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kivezebibevumerezop.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/7983382512.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/darafiritikaliwogubif.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tufizewegirujo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0abc9f2e65bd7b25c86a5a8d525d590a/15704899770.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/54620447243.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/195b96d8024a368affd79e7c678c6707/nuzuj.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/nizubivufuditizoxoxi.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/rixizevi.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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 10476 bytes
SHA-256: 2fc8592e707e72da68ddaaf7978e8f519bc8f481e0a1d22f172245228ad15fff
font_02_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 17104 bytes
SHA-256: abb5a0fc1308ea31b1a5c23ffef51223ee94619850907884daf1b97cb2d42f30

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