Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aef4b60ae910d82…

MALICIOUS

PDF

79.1 KB Created: 2021-08-27 01:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ad4b9850a4bf3a2d4b580b346e2fb9e SHA-1: 0ef93a9fee97225ff142fc990742ef09c180c1f3 SHA-256: 0aef4b60ae910d8224fd520ad10642a1fe0ec78c2d93512c9f16291b3e849494
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the structure and URL analysis point to a malicious document designed to lure users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://uniqrelation.com/userfiles/file/kajejutemalibaluza.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/wivokavinuwozakum.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e6dd4f197ebd05e1f4b80c87ddef7e4c/dutajojeta.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/42083140934.pdfIn PDF document text
    • http://aroma--style.net/files/files/juwan.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/arnlllb79nv9b00p3chl2jl2q1/nuxor.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/mivifirexowejejivosifafin.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620074325_180482859.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/wopewaderotubojaragatire.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/fetawudesisineba.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/88331560602.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa607bc7739---siluxumavizogipokasesoma.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/78814681480.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/51305725438.pdfIn PDF document text
    • http://michalbaryza.pl/ckfinder/userfiles/files/pajimekatutalitu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3563f4525390412def4dfb177fd95863/kufovavipikojiti.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5942b91d---88124008583.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/27564565946.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161059dc244026---fibufutamonugejow.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/78285624f003d40f38b345eec48573c2/70216296982.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eadf3b274745a64785b12bbf732a6307/zosepi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da1d2ec35---46771217963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+concise+introduction+to+world+religions+2nd+edition+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_off0000cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 10920 bytes
SHA-256: 91ffc33d77df352968b748393b40188511b828f163bfd11285a6f33f38457f9d
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16192 bytes
SHA-256: feec2afc276ed9c6a9ae03ddfb5c70f24eb82620061a611eb1c5d0c2c0164c09

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