Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e8d1e8c6b0d40b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 11:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6387bb27638b2a1ccaf5a1679998eb8a SHA-1: 22d9ad458cbc58777b23e41700bb3bed46e37199 SHA-256: 84e8d1e8c6b0d40b42df1a5efff84ff8d38f2158a79d4cc2aefbd000db98bde5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links align with the Spearphishing Attachment technique, and while no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ieeepes-thailand.org/app/webroot/files/files/79124159833.pdf In PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/denekiv.pdfIn PDF document text
    • https://viettrungson.com/media/Files/sirobenugulu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/15919045831.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/detuxudutipusasidexalus.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437cd064d6e---sanoretatabovodatew.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/nobilisisabawa.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/24149871266.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/48864026036.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/dibebiju.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-13/images/files/dujifexubo.pdfIn PDF document text
    • http://coolscape.info/images/files/90309778086.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/651910ace154befe2ddc36ef86a868a8/felipabotupot.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/ponevofop.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafe2b73a9---lufesuwu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c3c163840---53379753134.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd64eda26---ziwex.pdfIn PDF document text
    • https://windscrm.net/files/file/nojidamo.pdfIn PDF document text
    • http://zeci.nl/im/image/75136947319.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6eg0958bbk322it0fbig3s2fku/82968948070.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tagoditomeloguzujawogujid.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/26423513983.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140971fe53c4---51350520329.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vomilibumovuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=using+so+at+the+beginning+of+a+sentencePDF 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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 17744 bytes
SHA-256: 759f133d629f863b376598aa10bb42a9a7b76c117104eee6b769d3a78bfd0c9a
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 10616 bytes
SHA-256: eb2285f846aa03ed742837d398537fe87299ec0279f3f3c330a2ba666245f217

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