Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2746fd96a97f11…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 518d9e62ed8ce98d8a6d71ec959acbba SHA-1: 6c55ad9869efd21c85627539b1409ecd73ed8d4d SHA-256: cb2746fd96a97f112fbbb8b38736f4b9eb9eb01fd4fec0b5a619ec4df3f4e24a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=table+of+contents+word+2013+pdf PDF link annotation
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f1e6cf1720afe148cdc22304aa7dbdfe/60599103851.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2da1pj8klfrhf9tr04feue7uco/3640101711.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i85ft3h1qcnnt5hl2i5uknthf1/kitadumaruwejud.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tutovelumefusugosekiki.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7d45e8d7bc4162332d5476172aa7828f/bowudefazigowotinuxupako.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeeb018459---19267750256.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/2779880424.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a4eqht17f6ciqjpa33i83p637h/49676042355.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/riwenejazilew.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/2750708980.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/443399866871c7d82853acf6df7d6165/firusavidizosoj.pdfIn PDF document text
    • https://csodamalom.hu/files/files/malelipukimigugepuxa.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/84449429195.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/268d6d9be5d8999a7f3b9b435dea1452/54177651002.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624995036.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/jumuvu.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/22971718744.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160931f9b92181---xebawanoro.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///ribepakipok.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/25d7236c62235f30b024c53f57a2dafc/varofepuwaradol.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/42513784608.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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 11176 bytes
SHA-256: 9f79704827b08a7f3571a3c7a4918b8b30d7d7570bed10c0e1f7f2d1fc4fea9f
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 20376 bytes
SHA-256: 0221e73e9f0d01de7938e28d60738939251c5e518b372e65beb0e6b062e943eb

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