Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7a246b4fe4a332…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 00:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32867145c0b481353e760027e76d78de SHA-1: de8049f2b6224f16ce96bd7c8e2ed62128f7d2dc SHA-256: ff7a246b4fe4a33261154c81624975619fe8878d090adc1c7ef22833793d72de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://chcial.ru/uplcv?utm_term=waiting+for+the+barbarians PDF link annotation
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9f1362bb40b31efd24661ca2e4857018/88240092787.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0a2ffe0a8b236392538c0c52a13c35ec/gawoxitufajipug.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jawoz.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/54079127090.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s123io17r71csvaljioidhg92b/kokenur.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/41900542796.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/56d07f4cd8cecf2ecaf6fa119a2bdcab/79694091536.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/95kn2ss00smudqi64srbd3a286/xefalanusukukojido.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acae61717---67247287439.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/b31e3a22dd0dd4b5248098be2ce23129/xijisetunof.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd20830820---50437121291.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9kb1v67h63ecoh5jrfitrb19c3/34064507965.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/63348863374.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ae5a5ac8---mifiwibufijuf.pdfIn PDF document text
    • http://liyangah.com/Upload/file/14279696758.pdfIn PDF document text
    • http://ahchala.com/img/file/dolozavizitowik.pdfIn PDF document text
    • http://kelvista.lt/images/files/93036911900.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/lupinekinoporapekazetegum.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sowomufukoselivu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/30082086669.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/fexezibunubowiroguxedime.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/gudagej.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58095427273.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_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 17496 bytes
SHA-256: fc39045a04f1eefa2454e59f79c0f77cb3925010463fcb6421a11186841b8556
font_02_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 10580 bytes
SHA-256: 19d012ef18afdaaa794a8235bfdc1127cea524552d190b79a5f8b13fded2078b

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