Malicious PDF — malware analysis report

Static analysis result for SHA-256 5732dfa4ca7e4a95…

MALICIOUS

PDF

118.4 KB Created: 2021-09-04 12:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5d57d4ab9f659440d0b6f90907baa0f SHA-1: 3ecf856e67f304c5f2d237d64b783021a18bc00f SHA-256: 5732dfa4ca7e4a953ff0d7550a0f52ebe8cb170c61b071db5c34f48d34216378
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://zrdb-drogbud.pl/Upload/file/77091501677.pdf In PDF document text
    • https://bdaudit.ro/userfiles/file/21280716449.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/25035519623.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/cd87b14b90ea2e96ccb4d77e0b48e8f1/48641438291.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/74a728931658a867ae34d1ba2cb60139/gifelidiv.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7c831d63---befajilomajifabijosu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/refexonozuvowijiduwe.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/7066667369.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/136d1a3646145c08715d644c74282224/sedetuvubo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f31ea559c84---32667686698.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/17851568304.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4263e8d88d94683a63841f99564909b0/77922115216.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/97626634409.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/71qmrse2l0cqlm9ijc1b3m5vd7/83146186553.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/49042812474.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080539966a3a---64596681329.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210625202528.pdfIn PDF document text
    • http://geose.ru/userfiles/file/78106619147.pdfIn PDF document text
    • http://dejede.com/userfiles/file/37014531384.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zukabozagugixeruxixib.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37632082207.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/89693813568.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b084732c62---30081097210.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b6b44cc4f---gizebi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/69016448044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=canciones+del+camino+neocatecumenal+pdfPDF 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_off00015da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000175be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BE 10812 bytes
SHA-256: 7ef64bf30dfda4f1e962bbd5ccab77c9d173091a902dd58a91d03c3e98d6f6df
font_02_sfnt_off00018eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAC 22944 bytes
SHA-256: 80973fa96774110b848bb4d0f6848093eeac15a913ce5a19d5415da99c6b49ca

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