Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a0554600efe5cc…

MALICIOUS

PDF

103.5 KB Created: 2021-07-07 00:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf70f3ce92215b48542dbb3034553979 SHA-1: 70b0f27c56f7ca3844eae28ab3ba5cca2c10168d SHA-256: 92a0554600efe5cc5c2fb50d318896d271cd5f7e3a9a3887b3a6f25840e86582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/882ebcb9c11c73e6993290408ca35e11/tijisubidojuvinutibujowin.pdf In PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/piregude.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/zuzewe.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85947f303---44374411822.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1ce0283e---banum.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1dc8c6b8ea8833e8157e5e87c634104d/33162446386.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9acc91a9bf---54202392458.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/56152379961.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/98087420466.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d017549628d---nexitexofizaxilujoginu.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/zanuberofibade.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c082a546da2---93820600362.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a71a9923---85898567026.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/58527549957.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20e97ea3---46305181686.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a9ea94e2---34945163540.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/25802382747.pdfIn PDF document text
    • http://planbmedia.hufiles/90630029253.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/wopunosiv.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/48677204924f1ca7131ffd5021f3baab/kajatako.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/nefad.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce64e3ba0e1---62806579239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=into+each+life+some+rain+must+fall+poemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10796 bytes
SHA-256: bc69d8fcc47e529a763da72ddc9a4ade8752e3302884d18d7e24c025de05a6a0
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 9964 bytes
SHA-256: a72c351f1c814e098df97b8e5660b91c5af3b866f7cac3e148f925319984abc0
font_03_sfnt_off00016050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16050 18732 bytes
SHA-256: f7ecaf3badc1352a9a342ed574cd4a0d36639961259dc11957159072a28cf29c

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