Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31bfcc0dec5eef7…

MALICIOUS

PDF

83.0 KB Created: 2021-07-26 10:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b9e75ff8a0c572449e8c1bd04a5f1925 SHA-1: d2cc88c16c6b54afc2a05bfcd6ff13f248e4c8a8 SHA-256: c31bfcc0dec5eef7a5a47a715fb9067838e4874fc9db329fb4cc242b60926034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://juniorclublivorno.com/sitonews/images_upload/files/33094213831.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4f2a6dd7cb6a1d148d65a32d6079dcd2/50069633161.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h437rfpce3g5dut0lp0rflbi0v/miporosemeg.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3effe2ff16---64146968378.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/299dfe8f9178790cd4b07298403af488/buganepomoded.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/db20f6414cdb5d444ca88bd283f732b0/tasafepi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5819675ebfc3b757a8cb42f923a049b7/10225466371.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vokudutilezuwa.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/92465775962.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/gugezebubiw.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/56760511342.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/35816233390.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/disefumoze.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/872f1d1b12eae352c3ece1da2d922f63/56740803645.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91743802006.pdfIn PDF document text
    • http://agrion.org/upload/fichier/dadorapefefamejitavedis.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c7293617b48---72902875050.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/29576287671.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb923688e8---botavoka.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050909343773499.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nanorokuj.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/201901d0eb1dbff48a93d2e43dcf52e9/26660512072.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a0qrj4vlc0h6bpbdmibco97bku/89584384424.pdfIn PDF document text
    • http://medrea.ru/upload/files/35603884691.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/dowodazetilelutezagikop.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/boruloronumodadini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=writing+equations+of+lines+given+the+graph+worksheet+answersPDF 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 11120 bytes
SHA-256: 88f7f789574d566f9ff30a5d765678efdbdb76bde21bd889701b1cbf33096925
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 18376 bytes
SHA-256: 9bef79d0adaae4c9aaed8c07ce4138d7c3740de8fc045144a5280a6c4f992feb
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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