Malicious PDF — malware analysis report

Static analysis result for SHA-256 817f5ad6b20831a2…

MALICIOUS

PDF

87.5 KB Created: 2021-08-31 04:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3d29899397e21e2117715cc3a00df66 SHA-1: 04d9d07f0f8e4e1fec8bf2654a0292ab9b58f2ca SHA-256: 817f5ad6b20831a2c91690d41e4b5cc161d25b30404eea2c4782c7357f1fe39c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to various domains, many of which appear to be part of compromised WordPress sites or disposable hosting, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/uplcv?utm_term=my+cat+is+meowing+at+me PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160fffd551f0f9---sefawafope.pdfIn PDF document text
    • http://erdbau-rauch.at/34248089866.pdfIn PDF document text
    • http://ladangmimpi2.com/contents/files/jafesamogivigujufadom.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f4611e7540a---pufuzuruwu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/73432310644.pdfIn PDF document text
    • http://gysanya.com/upload/file/21083107081063837529rbuk8gcm8f.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/sunudeniwujodifolazof.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072700484562.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbca53d25a---9015191078.pdfIn PDF document text
    • http://finvestfortune.com/admin/userfiles/files/tupusewav.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/af8e3294af6a95f28e31d69fd8e9b1f4/newobozabojaxinunufolep.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c040db8c---80529329303.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/xutalodebutusutadixe.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/30855887430.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/58d3586feba411605c8a2fc5c5d4dedf/fanuwoxabefipof.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/zepojelozog.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c823260b24---30220960879.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45724d210---48229081118.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/018ee454010b45a9904ddc44ccf908fa/81768378983.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210726_0D65AC935C7CF913.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080529f65314---vakodatewiwukebidotaja.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dmupag6fpkt4dd5f4h4a1u95s2/jodajaworiremusefo.pdfIn PDF document text
    • 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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 18352 bytes
SHA-256: 484e9f7e97af346af944dd9ee3b340c23fa4f3aad864209bef66c0c109d79f55
font_01_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 10620 bytes
SHA-256: bee905ad2da4cadf3cea8783db2eb6be9b4a988a8c025cf0b378201c406c4cb6

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