Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecefea5cd59e222…

MALICIOUS

PDF

92.7 KB Created: 2021-08-18 20:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 060be03b8d5adb63ccb88adafef0ecb9 SHA-1: 09e91753b226b73e838623021a39c2142c0a778f SHA-256: 4ecefea5cd59e22228d0c55db86bb75fc54f418b1c3f4477cac3b0086f12fc0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for malicious content. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript execution to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9a8ec1e5---botugawuwodikatafukeraz.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac203bd6---18780617285.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/tutamakobovivikupikibaden.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/59cfda189e4f79170b142ef36facfa8d/tibudafikamupas.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4903d4bb74---sapironagulek.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/68004554687.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c792de8e9c---3503621581.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/89391392425.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5f6aae79---mipixusowika.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/69334230205.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/zuzejejofevew.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/bozuzomikesozubilumumami.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1b4ba967edc9494fe0e89c0d32059e7e/kusumawoxovumaf.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/28774811687.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d279600e68---1291390441.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/35067330391.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/mafifex.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2163413d7c---rezavilotopusesabajan.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/60327130324.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf0c04420---91924135321.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f5a148d078c5a68e23947ad4e29e2e6a/94267704896.pdfIn PDF document text
    • http://atya.eu/files/file/17825876299.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/174617230260f407538fecf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+crew+2+trainer+money+glitch+ps4+2020PDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17636 bytes
SHA-256: 42d82a4dce15973d6db7634701dbd452fc04868d0be730eca5892ac44bcfa25e
font_01_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 11304 bytes
SHA-256: 2df74ed32f688115d31572edf3bd28d51120efefabe4bd66c336743e989f93ac
font_02_sfnt_off00014a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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