Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d92ab7e24c1dcf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf157be2c0553703296bab8c6d6f8905 SHA-1: 3be930f0bb8ea30ff9138720de85b9ab50cccf06 SHA-256: 43d92ab7e24c1dcfdd9ec3fdb6f56687480b5cbd0505d8e23b8ad89df2bd79ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5da1b701b608bdfd2ab61350c4581288/90918185385.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lensprovn.com/ckfinder/userfiles/files/vixivinememe.pdf In PDF document text
    • http://windmill-bv.com/userfiles/files/rezizunomow.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/mixut.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a0b76afe---36829667230.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/3678665940.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/70070059788.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/wisug.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/59132542001.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/20941044751.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/960820d162dab7406a86ab6f266b42da/vifesexareminakimifiwupub.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qredc2orujrtcck20tte0ke5lk/42337699090.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3cc30894---86506600867.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddd46ecadcc89af3e9a25ffc1bf0103b/fekadugoli.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff820ddb972---33101318650.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/icej409u4mt2o88up3i3m6gqr0/56683253192.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80372cd0c---pupagutimibedumame.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xonevotoxisovewesojazoguv.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5da1b701b608bdfd2ab61350c4581288/90918185385.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qqjumcm71uu5j8d667dgcc8lke/31494079370.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/27053809682.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/48819764380.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210609041659176.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd07ec69e8---gadevitemodutiwafu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/fakawovematuwavuwexasit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=carol+ann+duffy+the+world%27s+wife+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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 17788 bytes
SHA-256: 3a257ba648f27e049578f214a39f64b5d5db5aaf0a68219f95cfec3145468def
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 10960 bytes
SHA-256: 003f21030a35056b62145426bafddd78e70ebdc3ff018574e6ff3fb87534ef48

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