Malicious PDF — malware analysis report

Static analysis result for SHA-256 161cbcf7fdf47061…

MALICIOUS

PDF

98.3 KB Created: 2021-09-08 04:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4927f9a5af9ba30034c2d3f4c875ac8 SHA-1: e7f52e57b3803482099c3879ca81ff2c26dac962 SHA-256: 161cbcf7fdf470617416a1ee94ee6dc227696f4b6514c37ac070d7f8155f53d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to lure users to download further malicious content. The presence of numerous external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mdbim.pl/ubezpiecz/obrazy/file/jogekakalaxa.pdf In PDF document text
    • http://shosholoza.de/file/vefezebavuwubomuvugipaxe.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/77742509957.pdfIn PDF document text
    • https://wittnebel.dk/file/38833212183.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081a6918a95---33768364350.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/lonumetilanuxidemirere.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f39aa703---rapakononusepanarusaxodaw.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dd4e0c2eb7e1fbd5e5fbec8af25328c5/33014598547.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/kupuburizuzegarovovom.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49150299d---49311401184.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sovizuzodamaresoboxi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/90d8df81f688c96f72ad8c62394392b0/rerarujavidadazonoxa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9b91decebec2d036fcb929a229d03a4d/fumewinuwa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45f2a362e3242d6bd5b24f955896e43e/bozesakigagovep.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/sanujiwewajabubeledo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b3fe5786b---romoweb.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48b05659401a9a001b0d06ebd7f159b2/nutidodaruwiwemaborolu.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/talixoxepog.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuvebe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb767b0bc8---67686582006.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/81382662748.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/84b91f42a90580156cf7cc1874b130d6/gadepilufuxigidebobonu.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/99617670567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=trypanosomiasis+pdf+indonesiaPDF 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_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 19768 bytes
SHA-256: b65e6ec3d853f9f5202cbe0eddbee2928e0a030bec9fe893fcf7448a63deac38
font_01_sfnt_off00014ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD2 10592 bytes
SHA-256: b3d11bb14176b3ebd98a1ad3a149c05f1e1abab717d9141dec604784be86399e
font_02_sfnt_off000162fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1