Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d751fba117e3f9c…

MALICIOUS

PDF

83.1 KB Created: 2021-07-14 06:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e72e9c72cb6d5c621c1eadba839ba7d7 SHA-1: 6abff42fdbba8425f2be15115f31d69b17a400e5 SHA-256: 7d751fba117e3f9c1ff550b1e3709577c20f630f179f9d7b93241ab1e130269c
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=email+for+thank+you+reply PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ndl978qcscrn5kpec0a6muf5lb/lemanonijupadiw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfa4963b2e---18529228950.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcc6edee2---3473726547.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f99c8b6a07---jaxajisuxofipabasegubutuv.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca71ba064---2010868893.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/porofupazaxofeso.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/205094353060d84fd5dbbbd.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/35922262801.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/ponuboxox.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dogigorasomo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/467d4eff36da524cfac6fde9ac1c05e6/nojomenone.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/latebolilenilegakof.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90333eff6---74620442603.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/givizu.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/retogogowetovigijapexog.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/14342424896.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6385a4e48362af765755cd47f7aaf6c4/dabejuw.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/8712285192.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/74072297261.pdfIn PDF document text
    • http://artospace.com/pics/file/razek.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607362903d9ca---tidize.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/88126945883.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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10744 bytes
SHA-256: af73cead105224043db31f26e4b7b734f2ae8f243479e91c7fdbf3519910e7cb
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 17092 bytes
SHA-256: ef6cffed473d7ff1be162710d6bb6a2d2e74a50e1ad323bc2121a15644dbb756
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1