Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef5d616d398622c…

MALICIOUS

PDF

82.9 KB Created: 2021-07-08 00:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76b799f102d444eaf2eb458f7dfbe7cd SHA-1: 16bb5b9f7a6591648870d1fa7f9ca5a40292cd70 SHA-256: 2ef5d616d398622c841e2593fb000f329905fc63301645f94cd6dd44cb231c03
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, which in turn serve other PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, where the initial PDF acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=topic+and+main+idea+worksheets PDF link annotation
    • http://project-st.ru/userfiles/file/fujigegamoxez.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lo0c7uat8pav3lfopeer446kac/99333485851.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0d8b9bb---59983178445.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/30548489955.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085064263382---furosapiguxesa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df606f924---fovuzewotewupikepexajebab.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ml3rka24br92ch03q32vnqbqdq/65247804029.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aeac04f84---fafatoxedanedibomosuduka.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5995f062e4e2838bd5cfac94ec4fcf1f/lubupizutuwubolijupa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c3000d50d---65891162806.pdfPDF link annotation
    • http://alibabashipping.com/userfiles/file/88677499123.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd224a5a5c5a7388883c93147c293d0f/wovudejiwuwumobesixuzez.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9h0grn32t902v5tnmnn25qh1h7/gegezuzex.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db0945e1c5bbfe4a4fb1304bffe4c638/41270135717.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/pevira.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0ac8946c5fea2fa7bc7d06804b125eab/wapisikuvijumogezisutaz.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jiporan.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b40ccdb8---jomojufub.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/28117827304.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/58457479252.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/m82ed5jhkoqq953odchdjjm9re/fazonoposisobujiriviz.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/68704117187.pdfIn PDF document text
    • 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 10876 bytes
SHA-256: c7bde182f9b12a134193df50d8e04f46fe8d1461d9a8f540d47592c7196dee0a
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 17236 bytes
SHA-256: 4ab2b500ec3d58bc12b58270a898d19bce9aaabd568289a275995ab8bf685e69
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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