Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e56788ad2a61d9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 03:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdcf8c400dad81624d47ae1d895c0215 SHA-1: fb8afd4d1dd8837010f06abd8c68a24c676a616c SHA-256: a7e56788ad2a61d9ee6031c3d137544afe068cfe09cf362f37095f197ffb41aa
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, and 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=guitar+hero+world+tour+android PDF link annotation
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/woludato.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakawakomomizakuboko.pdfIn PDF document text
    • https://titishop.co/upload/files/zemufuwi.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/kuselevemik.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/37336809872.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/10572516750.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/rotorovizezawetevud.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c2ad376d---46978225612.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/15385288358.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/debolobaf.pdfIn PDF document text
    • http://nscenter.cn/upload/files/95917711724.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/dutozeneb.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/38582685168.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/gidukoxi.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/98434914057.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/97134825628.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/59438160889.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/waxenujupolafol.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/42703224580.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/dizex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/993bd1f25e89b7737e154e73b7441945/dolopik.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb276c7a---pekopebofex.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/39371974470.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/57937502557.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/rutupaxilaxokaru.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26a7d5b04---tebuzopebabok.pdfIn PDF document text
    • 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_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 10400 bytes
SHA-256: 3250da08ef51e30d1287aaa376e190618e1de3617ddbee36a915b607a75bf3aa
font_01_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 16596 bytes
SHA-256: 9de6380a75f0d6509ab1f2dedaba83b72ef1b24a3b81c34d6dcd978f83034ac9
font_02_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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