Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac8dc678c900781…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 644c1296ecc1555dbddeb87d7be90613 SHA-1: f1b29adef3909af7a6714265e5a7db629e4424dd SHA-256: 8ac8dc678c90078138b38f1e471fa2aba50fa42d2da110622ddfa4b261283673
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload storage and other disposable hosting. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://belovosushi.ru/files/64063219875.pdf In PDF document text
    • http://biogenetec.tw/image/files/20210822_064805.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/olsn9nfd9cjk5q5d7j9kte9h74/29080130218.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/77624323509.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9689656011---jomiganisurupig.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/xejikotudijuzokig.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/89488307149.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/80748294225.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/zekewubamab.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/66981066959.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/726b39db57b468374ea80fb187b6f438/vomorex.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32893a8c6c---bajaguvipurifitixurarexav.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f4a36396b3---8536080284.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/mikukaranobejok.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9ea45e92c---87089361001.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/siehdgpmfjbn8b7o7668lrh0f2/73084280694.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/52e30ff14a72ebdb59f4777d02950555/90336772687.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/8345525255.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/tipanozelakotubusor.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qc6rnmfq4au0hi9emrn1n7ogjd/22685979502.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd605294541---ruzufijekigunusoxotido.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160803006c99ee---63502395383.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/68711506271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=diagramming+sentences+book+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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 18072 bytes
SHA-256: 4c8e57e26018284eaf5abe8973d1e5a4052a819631e96bd455aa81a5e5ddb8a1
font_02_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 11148 bytes
SHA-256: 293e9e1b46461f71065613b89b79b77e02f98f526d1d7ee1e9c9ac8a1be005bc

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