Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4bfa53ddc5fbc7…

MALICIOUS

PDF

99.6 KB Created: 2021-06-20 03:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a550c084a076f8e238d9a3e8c1f2dd11 SHA-1: 233f804e788357e6b46301a205a7bf05cee3f402 SHA-256: 8d4bfa53ddc5fbc77a1db9b79b039426f8924c1339e5f2a77393d3ec25e43fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://philabc.ru/uplcv?utm_term=jotaro+eyes+of+heaven+pose PDF link annotation
    • https://mimpiindah1.com/contents//files/nojotezedix.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/puduja.pdfIn PDF document text
    • https://proxus.nl/file/49484421896.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d2f3f195---59540302986.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/74533199343.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gvdlvc81lhtnlhdvt4g0sjjlml/43970829213.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf001b922---91157774624.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/58d00c648431f02eabc89372b1366c46/jukinojamalej.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac755e0967f---linidi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb82552441---guvak.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0571623e---12221091655.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/88259706523.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/tejusexisiwaresusexeba.pdfIn PDF document text
    • https://yellowstonewildlife.com/98737318787.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e13a982fe---jafeliz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/abc1l8uni84h5voqk2rl3p3rf4/74434029308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 4136 bytes
SHA-256: a3fa61ed8912e0087ca0a6a0617faecc21ffe6af3174796ab0a15cf9b0f7ffbb
font_01_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 4848 bytes
SHA-256: dc804ade758cf91b4451d830a8de83d66a535dc859b4110f4565f83d276a9241
font_02_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 14420 bytes
SHA-256: 1b448925b42e84c09924a82ff0ca6d43f967a68a7d0c6ef786c503e577f2d6b9
font_03_sfnt_off0001708d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34