Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32b104180ac9ef0…

MALICIOUS

PDF

63.5 KB Created: 2021-09-28 20:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7415fc017a41d2708d505f6881661382 SHA-1: a9eeea3440e4735493c7ca58687e98881e9d8594 SHA-256: f32b104180ac9ef01b8ff01e229597f7db56830b4b236c91c64ba92663bb9614
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious redirection or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5809

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/uplcv?utm_term=how+do+i+get+weather+alerts+on+my+android+phone PDF link annotation
    • http://escuelasfutbol8.com/docs/files/74007962029.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132edf07c6b7---73366573284.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/mukoxenutorikomovebonozos.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/37744597123.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee4069fe8---zowubapuzafadibujusu.pdfIn PDF document text
    • http://husplaza.hu/editor_up/32721293277.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0ke6a1jn6sdkt4si59tr4iplo4/45779400767.pdfIn PDF document text
    • https://dolaodong.baohohoanglong.com/userfiles/file/49889099519.pdfIn PDF document text
    • http://furniture83.com/upload/files/fivutuwotugoruxe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783fa137b2---70587584985.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/58320033941.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/25310549474.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/71030425158.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/98023606881.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c7nb3m70n9d3r9943euo61rj9o/74174108513.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/wukisolobuvogajad.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/71548715613.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/pazisilef.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/99390977887.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/60803263913.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/vuwezekelolosifadi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/buwabewu.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910140612021.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wetamevasubapi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 14564 bytes
SHA-256: b17193f2297de683c79565839a1cf1a5af103d71b0ac947e34f9c693531166e2
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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