Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fab3508c3161500…

MALICIOUS

PDF

150.8 KB Created: 2021-06-23 21:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 56a83f8e43e271c07e552b5d4f7e3dbd SHA-1: 107ef4a0a0ce0d707edef91cbcf7b9b5cfd90887 SHA-256: 6fab3508c3161500ab30945c9f463a8e1e86cf123acb40bacd79b8e31c7189dc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Autism treatment pdf'. Numerous URLs were extracted, many pointing to compromised WordPress sites, which are likely used to host further malicious content or phishing pages. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c5592af66---sotirilefupe.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/gipedolakoxu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35d25ef262---20192310897.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9b72fa03---fanelaserevapilukenepeput.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/rezowamakalid.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19e651fd5---34953626734.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bvrkjbhduigtec195o84tti106/46134946776.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210617184705.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ef99497dc---wibutukutefadotoxeji.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/74021387733.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/jivanifobasisinubuf.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/29610017188.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5n8u4le8rtk73hi253srhhm4g6/55549358673.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1rt11ft0bk7seh9tbq62tbmc2/54733684057.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/litamo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c9ae18bcd3ca133c9c9509985c2a4576/jewepujij.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2f0f54606fb9746d16b5504eb7b5a439/zaxoninunuwanedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=autism+treatment+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000212b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212B4 5144 bytes
SHA-256: 9da03851854bf04b5b09f9c7453af0e2f5406cda7e21bae51fb6272540698b6e
font_01_sfnt_off0002241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2241D 12900 bytes
SHA-256: cc662eacbe64fb0ab99512f1a56ee185f73b55eda5b2e75342823d27ed4e60d8