Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c95fdb791f69fd…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 01:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 669c14bda888728c4fc773360b45aa21 SHA-1: a6d466e90db3298c9208e08ec002f3246a9a9592 SHA-256: a8c95fdb791f69fde9b58e516a6dd1c4a66a9549f353e39f43f719ed35304e62
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. No scripts were extracted, but the presence of multiple suspicious URLs indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078827f01fcf---jedagesasolojidisamil.pdf In PDF document text
    • http://capri.lt/userfiles/files/76935204301.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210709223133.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0a862dc07ab0a1357982fd22a3426850/70222403186.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45e44ae8ff8cc997dee75c86f24ef19e/jadax.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c628c8815d2---kirifiwovojuruvatufirepem.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/38836273940.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/iqtoe31ak0r94paq8rasm076oq/metapatetoxisoduti.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/42304706964.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/selosufug.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jelit.pdfIn PDF document text
    • http://talleresjpg.es/img/file/43003908609.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/7579153605.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e68557942---tesipazidofiwejitotura.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc8cde0b6---tusad.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/22716094566.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/47467509461.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210708_122758.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/41025276687.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/14118654749.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f6174d92---79445726150.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/93526235300.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b5c4c43---sarotixubexejeda.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/tixiwinopuxe.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/73557361921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cut+and+paste+letter+sound+worksheetsPDF 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_off0000bda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA7 10704 bytes
SHA-256: d27972b613cbe52391892dcef6f230b0c85b4dd2734895e3fa6733786fd31d7a
font_01_sfnt_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16300 bytes
SHA-256: cf61a15a0e67abe4a5c3f1c58c0a701da5abfaf5fbda28fe20e185beb30796db
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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