Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f48457cebf3e25…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46032f481379c7d853e6b9ebe36c43f0 SHA-1: f5f64243439aa604ebc8c6b0719ff183da6ac7cb SHA-256: 44f48457cebf3e25bc3168f937cbb46c8006b4ffd59b0d26c7a6731600a46b0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection indicate the PDF is likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kpghomerepairs.com/uploads/image/files/44008462253.pdf In PDF document text
    • https://support-trevianum.nl/userfiles/files/77904082114.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/14459319218.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8d6d1990d2dff4730fa34d610110ecd6/bilofomavofibegob.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/36993785300.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/sotevevuxelakimo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615001507f154---jafusofiw.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • http://northcity.rs/slike/files/25114532936.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/retazegobowopupufizepivat.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/wezalavaxat.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/21902930425.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///38506237822.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/xuzatenave.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pitubademenefotedida.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/62586086658.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/2143191523.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/63772085858.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/manuxinivu.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6151873c1fee7.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/25394110892.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/nunedokuvivijijedud.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614393b6c69f8---56584987829.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320cc7b0a13---zamufiwixaredenuluna.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/2713854156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=root+my+phone+with+pcPDF 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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 16848 bytes
SHA-256: 19e1399c8141a0c21357b063e84805ebe8a0b7397bb719434c844b05a3597750
font_02_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10408 bytes
SHA-256: 79800e98e9f8f7ba9dc7ab256de870deea97edbd3345eff48c070e855ca6df0c

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