Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca47fcfa1928740…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 07:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6a15d9fdbfc922d38e5e134ab844a63 SHA-1: 19a2be215d94b7aae8306f894aabe0b94cf5a525 SHA-256: aca47fcfa19287404fcb1ec450b547b41d81feaa1d097c65d5a88ee1a624070a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it could be used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7934

Heuristics 5

  • 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
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a8445f688a7265185acdf512138feb3/rekamexisafukusirofewixi.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e1b54a9c---livolosutoresarot.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a49d0f2c6---54897359502.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/fe165292f0b68bab8a5cb3345d22bd04/xabenerasupefazuxovot.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/88225008182.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5d0473f4---41785985428.pdfIn PDF document text
    • http://imbirimbir.ru/files/77302737581.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/24615463124.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/40041963840.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tutebipij.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210515124955.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2035957606---mutunevakavovelabodogopu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccf478697---zegifozix.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ljluoeh4kn91tb4of7dijki6b1/6661806146.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7c0a7hdt42ljuv44dkqbi8reem/23984763921.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d69490de---ronojujavebaxibirexem.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083e484a0691---24935264835.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/40055999384.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4ep912hi9a3rkqicph7ho4qvs5/xumidirujam.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/mumurobudazuxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=edward+poon+barristerPDF link annotation
    • 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_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 9712 bytes
SHA-256: ff6ff5aecc95e7200ca0bdd3129142d7ac31f798396f6d82810dfb5200da65c4
font_02_sfnt_off0001404d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 10548 bytes
SHA-256: a6f47ea4f362b1062f27075c0ab64fdf44c3443ed558c6406d22433e819fc05e

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