Malicious PDF — malware analysis report

Static analysis result for SHA-256 58249e344568bd1b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 306a10b9a2ee6723112b9a78b07eac57 SHA-1: 818669835583223317aef03f901e1363e83e0886 SHA-256: 58249e344568bd1b2f8b160e7b553b4652c38cb7a0cca3e5520eccd7b2ef1a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ippon.lv/uploads/File/84190735642.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/j14ht46jevtrv8lpegpfh8ftt0/kakonuboxijebolodigifujoz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b658531d61---46191508309.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/wezuwudob.pdfIn PDF document text
    • https://cartolmania.it/file/lunuveloto.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a571379d3c---27248433069.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/82295256085.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7338f7672b40272125f7ca3bfdd1b87e/11639096367.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4970edd1---biwufogira.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nazotorasene.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/85406987942.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ded94ec98ee---fapalu.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/29308068434.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/8409265644.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nasuzobip.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/aoa2vbbd5fsuc31g05fjjnj707/76947828329.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6ngambar4gkk4hfva7svaaf2v0/jetefijepirizajokuxas.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/5462874634.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/55518515689.pdfIn PDF document text
    • http://vhktn.at/images/content/files/81624043875.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc6aabc5c---tanisakubitugib.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/namidiraxupilu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d23d16ef301---12093865890.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/xevujepalaka.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/lumerutodoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=instructional+design+definition+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_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 10848 bytes
SHA-256: 81ba765a8254fe5f4dee5733b2aa5c843907e6d546fc374cfc665549d780f047
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 17556 bytes
SHA-256: b350b734522dc48c29db01d02c6556876c5346daa5710cd0d5bfc3421aa0379b

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