Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aeb66b0a6818f9…

MALICIOUS

PDF

74.0 KB Created: 2021-07-03 08:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 760d8360d01c617a2b02f4514636bde5 SHA-1: 4341b9d6e871352c2d6ce58fa271d5b591999ed0 SHA-256: 71aeb66b0a6818f9d2d4dae51b780a972cf4202ba3e80c439428c963b7dca240
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://espiber.cl/images/uploadedimages/file/20288185403.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/latek.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1943e5bbd---tixoxepudipigu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084785acaa76---xuzanere.pdfIn PDF document text
    • https://afayl.com/userfiles/file/53744137107.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/308e37gnefv72kthhg8tnrtop3/92861540006.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/319ab1332ecbbef1efb2400d7aad07c8/kujixatodosatenuzo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c9d198971606f2b8ef97473a7b683465/zagemepuvunubexu.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jalen.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mixufifosibixigus.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pavozosoposalofosematu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1c475c3d54e0fea064fb96830a884079/24802853830.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/pedarotirejarerujudo.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/xagejixularibuxezi.pdfIn PDF document text
    • http://nensi.si/upload/file/23205859454.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2afb9b99a---71148714670.pdfIn PDF document text
    • http://temple.mo/userfiles/file/jagaje.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cd4c84b6---95298736857.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609954fb31d7e---vosozukobilovun.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0160941b3a---vezolafewogeralisubejiwaw.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/175337a127119af9f9ec86bb9e906c35/12726120097.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c13b0e5e---1680896935.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f60cbe1d997e156e3969d99e1dcd3457/jigesibes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cours+analyse+2+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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 10668 bytes
SHA-256: 8546187cd6104e66e9a43793f0221796ea0e15264dff11567fc9a1b14c8c7b33
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16760 bytes
SHA-256: 73ec12221683351d3c0d6f2b7863907214e4981d8a0d1ee3247238d41259bc4a

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