Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5c7c0473dcfb61…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 10:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8855aadb214294b13cd80d625b038fd2 SHA-1: 25e28d6f6eb097c2bd6cc0533c2c0c1255586030 SHA-256: 3f5c7c0473dcfb61af1593b0e1c73ad4b6547134be21b3739293729f7ed29b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other potentially untrusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

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 http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613801134fe24---penemekop.pdf In PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/sazerifewekexininemo.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/3981307215.pdfIn PDF document text
    • https://ms2oke.com/contents/files/mubusesigogawanaf.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/mesaxojefuzeniparun.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/55082739025.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wevat.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f729fcaafa---88979436875.pdfIn PDF document text
    • http://adice-area.com/pictures/files/44316482186.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/vodaxuxujowajotov.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161325c62030d9---7325365046.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/42766986660.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090511040170554.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502f2813e2---perizag.pdfIn PDF document text
    • http://skncn.com/u/files/musewoxelesanemale.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396808277c8---kovujegovamubobogojafiko.pdfIn PDF document text
    • https://rotitelor.com/contents/files/65898803318.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/59227446370.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tccepj7ttt6plnfq1dhjc5utu3/72507652888.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zitefujete.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/fijejoselivufelukoveki.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/kabupises.pdfIn PDF document text
    • http://midospa.com/upload/files/13127258319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=duck+dynasty+android+gamePDF 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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 24004 bytes
SHA-256: b3dedf70b9cc3ea66dc36c42b0a3d57bd31ebef658fbc897cf9bcea84ccb91d2
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10976 bytes
SHA-256: c5ca07134b41677fa5537d7db05102050d372f611935eeaddbd52722ddffb5e5
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.