Malicious PDF — malware analysis report

Static analysis result for SHA-256 597ba5dc330b2957…

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 21:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cad595d6083df34b9a1d662ff7c4ec5b SHA-1: e70e83495d2b7efd0878cc79cc203d7c1cb552be SHA-256: 597ba5dc330b29573b820502edab5d4039d0a4ffe94ac3c18c4ddd6090ec1b1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting numerous PDF files on compromised WordPress sites and disposable hosting. The presence of a 'Download Now' lure suggests a social engineering attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spoilersmensgolfclub.com/clients/865201/File/numon.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc544691d1f---51825048005.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3sd0oai8e881p8c8mdoq7vp2ft/71920634286.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/dugekudenupotizupinopejij.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/pubasazid.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/56738140784.pdfIn PDF document text
    • https://proia.bg/userfiles/file/werawefumawaxobopemadopox.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/59192769217.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fowiteti.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/mijodiwuxajutiguramesare.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1072617683608e7c1d3836b.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/71232571559.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/56055509759.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/95210555808.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077c276e1f99---72298335718.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d58glvkvv4f9a0cjiuofci5207/nokelujiru.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fab7b7cbed7b93521e50db866e5d8d5d/38218829900.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/gedarelorez.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb70940a67---sukejolowivi.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/35923630593.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a36faa72978cac61c45376b48841a90/jirafaf.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16212918152738.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/rexulozikipuvijavovetoro.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rhlensrb6net4pdclnbjg4g7sf/52840150763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vce+exam+simulator+pro+2.6+1+crackPDF 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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 17360 bytes
SHA-256: 1c9f68465a3e8a437178463d90c62c1aa10279463dab7863aba26cc6f72eddf1
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 11100 bytes
SHA-256: 926f999cb6aa2126340a1655bc863665638bf342065293581715f0e465186ee2