Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e0fe616825282c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 04:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3a4ce8a71d77726dee663a2d46f9f41 SHA-1: 0891083dc8a4c5ef2f35e9f8ef37dcb4685881e9 SHA-256: b1e0fe616825282ced4d1388fc1f2de88046b68080ae1ffd17aae78b4ba1ce97
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to leverage these sites for phishing or to distribute further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pingthye.com/userfiles/files/81896081312.pdf In PDF document text
    • http://autoachtercamper.nl/userfiles/file/zunovosulex.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cb8006d843569a2520f520ba016e3618/25618915291.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/32749292422.pdfIn PDF document text
    • https://razredna-nastava.net/files/nijumowupekiwataraxufi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/74581624534.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1ba3240868e4dd2ddcc0463d666fa2d6/damupi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/61bb55593f2208b99c180acb6fcd3a46/wumejinitirukepava.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/zofenurij.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070903484571.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/velugirigobuxidenexagafu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55d6ffb9cef359757e466ee30d4479c2/fixok.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9be697a2adabd53189eba6ffcdb62313/nunesekofidaravaju.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/554c14e0a91d67293ec1ef7cbcc2e2a8/jusedizopolirivosobena.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhd7q55lkqovid728cs0r7g0g2/bafififofo.pdfIn PDF document text
    • http://videlec.be/ressource/file/viverizifejuxeduwigeko.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/82e6492888df4f29ca44a4fa3dae43fa/natadawaje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3575989e95b7ea4562ee78ecc3c96351/57837568408.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/kupurimadorikobimikabevo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74ced69d8---pokixugalezugujanegi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792cc5726a0---wosanemamevuxewusoza.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/44410991975.pdfIn PDF document text
    • http://flyags.com/editorResources/file///84159218349.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210830_9D30D90BE1F4F2DE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=effective+time+management+book+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_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10932 bytes
SHA-256: 5c6988203ed66d8900d758d7309477040d42f997158354f043d8d291e60a4f99
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 17284 bytes
SHA-256: c43f10bde62f9ffa12e4192b90456ad818399ee9bca244c5314c54d03d9a9f19

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