Malicious PDF — malware analysis report

Static analysis result for SHA-256 b374f5c6322da761…

MALICIOUS

PDF

98.4 KB Created: 2021-07-02 04:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cafdf3f9f30340d85983896dc931f517 SHA-1: 5df3be17efd3af8dba1b8ea82458eee634e5dba0 SHA-256: b374f5c6322da761861117e77979ae54b3d5f2b26c7454453caee036c8f554a7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to numerous compromised CMS upload locations and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/buiu2n8dvk71k0v3g0qnp5nbd6/seluzisovobizoxan.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/um55l5grh0b8deq33eongktrd3/puzakasajavoloro.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/71731161103.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cc78fc836127c6b3e138a1f4505ea7e7/vijive.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/35994860072.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c5c6491491e05f9edb0921d48853e34/75786951891.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vgjj2ufjrjtv2ehlu733qjm1h5/xaroledi.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/24715489812.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c521c5d6a4---67423938964.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nurevelegexawowumotajut.pdfIn PDF document text
    • http://krzeptowski.pl/file/78865213688.pdfIn PDF document text
    • https://x-software.cz/data/file/gagopesudox.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/55104928291.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2eb0a67c---zesabutijibiwofaj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8b766c31e---45487576362.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/diwapuborojokotexilukir.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/226fa1fe178a01ed44967cbc796dd216/99051737808.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/6499780362.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/12129367224.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/tanuvidazopok.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38ba62f4c7bb8a9fa90a8526edcc4893/betufidedebix.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210622171036409.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c01d35e1e---wenumipig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+tzar+of+russiaPDF 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_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 24620 bytes
SHA-256: 5a1cd9cba0e76b99051a9b84c02fed56dda7556155e64d089e1177e79693dddd
font_01_sfnt_off00014c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6C 10064 bytes
SHA-256: 6717b864a8c4a29b4abfacb578d9e301e38561e8946d1a1fd029f851a1e6c95c
font_02_sfnt_off00016302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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