Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa55d1ec10b6a959…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 03:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ef10d9bfc7462b995d308fa8c5bc9909 SHA-1: 204422d87f77438f65215d0a7e77203af4bcb4fc SHA-256: fa55d1ec10b6a9597ff0c6147cfda130e771fecc93e57bf6841f5c634c8da5f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect the user to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://statsale.com/data/upload/ck/files/kazokajigobobedovezif.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c47f823d4---ziluzazekapo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086206ae9a41---rijifepipisegegajumorobuw.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/tudesapuzopizan.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/23002338432.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/026db5419ac687bc19b92560caf558b5/jawutaxugamuvido.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/56641322474.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/pcuoo2d7t1uqc3229bhu0nidbs/89149291645.pdfIn PDF document text
    • https://noddy.nu/images/file/danirer.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062707053157.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/tabukiwukojapi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/xeparesosememujog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609809b2bf22a---renilalekagetes.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34bad36a2---25690065330.pdfIn PDF document text
    • http://htwy.com/upload/file/zopijewibenimapetet.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/50a2de63d83713e75d9b6ab73cb26389/xekij.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/721d13df239e587c938f48a989850c2c/7415289482.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2bd631674a6d225aa2e875d01694a490/67206886126.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/24193390018.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/banabalifuni.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3b1ce9702b2819e37c5ce14e602a099c/91138281983.pdfIn PDF document text
    • https://123natura.com/stockages/files/44491062157.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/gifajanebur.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pozafidowiwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=things+to+do+in+ontonagon+miPDF 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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 17716 bytes
SHA-256: 45582c303f2fe27fcfd47ebfc392a5e4194d84e058d11214b6601ba3243acd89
font_02_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 10380 bytes
SHA-256: 62a56af28921514176da20a61fa4ab62f3d2223255859dbf2c197a92c2ef55ce

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