Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47d791ef69c7dd3…

MALICIOUS

PDF

73.3 KB Created: 2021-06-24 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 27735c6098f7ded00d76d2cdc64379a5 SHA-1: 3196d6fa77342bc27f765aaa7a77c9de1b5fbe24 SHA-256: b47d791ef69c7dd3821bd8d1337336db24ae3a4e0ea9d81f8f2936add815b631
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files. The document body, though heavily obfuscated, contains references to gaming terms, likely as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f7c9cd8---44774136582.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d004591880---11085714927.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pupivaxajo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/85637084738.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b0da027f---rajerugololigix.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7f7c5f926---46089855913.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/snms4qre007k6eb1nbkhgimabm/minewozoxoluvudur.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecef933c64---60957421994.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b00126de7---66542548182.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/109d1feda900b4c7ea1ee93c79432ea2/xavosofiwavifapowupem.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/23847972069.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/69e3fd1cc37ad1dd6046f5cd114e479d/63873423781.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/94iq9kb8usdjdq0j18bjko6rlk/bisukajofofumipomexuzi.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zujodiwemifadowafupi.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/GLLx1DTH0VQ/uplcv?utm_term=aim+converter+valorant+to+csgoPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5168 bytes
SHA-256: 42d1a55226f0c256782f1954e1e16aafe8b1782d19906e168974e5f270583c2c
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 11196 bytes
SHA-256: 883a7616cfd6d41a0a66ec36cb5724d3bb0868c751a1142a828074c1219d6810