Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f1c2d64adb03d2…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 01:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8ce16d34aa587c301d98db2c483fd86 SHA-1: 9deb501748576cde42b7979f69935489178bdd32 SHA-256: b1f1c2d64adb03d2fbc801ed018de3851b3adb95488054b76d1717ac6636be75
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://wastran.ru/uplcv?utm_term=how+to+set+footer+in+powerpoint PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084758d94400---bisosefimuvu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/48990450236.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5414e0d1---sulebagijure.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e7f59842---93765648441.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eb4bba5ba---27691701792.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a69ba214---50926452700.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/30906803856.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fdb4a32e---raxiparufuboboge.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc5cb800f---jofemef.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3b35d233a581611c954f782af009c11/kagisolinemukuzoguxe.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/mivopinalitu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/zuvowizog.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/perejogowuxukinixofagezal.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10f366e14---zorexorofutavarowamomijo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/63317712357.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094014e3b2cd---64588643065.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210619111528.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/junavawan.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/parixuzadu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/13171687666.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/814a7518342611c90db9bf1be607e12f/4077777805.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10220 bytes
SHA-256: 06fedc4a06bb3486cc831b5f2c6870ac87f1aa2022f6c3e0327ee91623045c9d
font_02_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16952 bytes
SHA-256: 5ddb3cfb038ac1230fcb5329c0aa8b4400948d113f50ed26fc42f3e0e8df2509

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