Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529e5791b4a28f8…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 01:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 26b0264e4b1a95b6889290b1d9bf6f75 SHA-1: 83e1bff605f0155735f69f1cad5df3fa706d193e SHA-256: 5529e5791b4a28f82831ebccec1af165343d7c6d5213eb7bee72a7c38fba3f9c
204 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the document acts as a link farm, with several URLs pointing to potential payloads hosted on compromised WordPress sites and other domains. The presence of a 'download button' lure and a 'password-protected archive' hint suggests a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983134a4b10---99546568770.pdf In PDF document text
    • http://digemnd.com/UserFiles/file/fitenefi.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/69302449332.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fuvosux.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e738b3570---jamolapirujo.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/fezexejetinasasexep.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/93158823823.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/74156539820.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528c5e8d14---58555858393.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085351c28957---juped.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/bibisuzudopapofari.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/44ea7b0cdb86b6ee57b2cc83c624ee52/16820495763.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/83059674836.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/csergad8tfqkt4u5t0cht4q0i6/51776551157.pdfIn PDF document text
    • http://accronline.com/userfiles/file/soboti.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cge0hhqhsqvolcl3cep79qk0v0/41333931289.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/869d920e4e391ec657e12dcec11b7cb1/60972861042.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/govikiguro.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ecfnrinq11jrn0q7q1127ihpt0/fupese.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/94578644681.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/sumoji.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7krjsenar01csu17ivfbs1i5l4/79923883740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nfs+carbon+full+version+downloadPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 17160 bytes
SHA-256: 50b916f995fcef2ce0dd0149cc380dd104e3d1a1c8ff8109c81889f58bad0761
font_02_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 10740 bytes
SHA-256: 37558427c37ca501fb92be3b56e772dc7e22cfaef191d1cb9af8d18febaf445a

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