Malicious PDF — malware analysis report

Static analysis result for SHA-256 37186c57a5819b60…

MALICIOUS

PDF

111.3 KB Created: 2021-07-13 23:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2304a533fb353be597da6efdec040f9 SHA-1: 53e8d04b0c2dd7ade368359fb55f4d32d3b77911 SHA-256: 37186c57a5819b6053e341b636474ad24d054605b665775ca0904fc99ba76bfd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress installations, suggesting an attempt to leverage these sites for malicious redirection or hosting of further malicious content. The presence of multiple links and the use of compromised hosting indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983498a51e4---75720238233.pdf In PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/28337229999.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c343b47710e---40121526255.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081934368f45---garizelirogedivedefud.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/30988677861.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nosufujum.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a65fe6d15---zezoromiwawokafagadub.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf31bcc2d1---rabalaseruresukog.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pfbhof3n364oamslnrtsufuddo/48473029890.pdfIn PDF document text
    • http://beateromer.com/bilder/file/50635294962.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/29686359326.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/07urmagqsk19r90jh1eai627sq/68557227651.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/bb8f059e7ee4b09aa08706f2785c1f71/gopubuxixiva.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/fexajosuwod.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/76442425110.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839a69b7c31---24387221604.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/bodof.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sn2ph5p4dvnb77ud2m5n8ikbqi/nejusebabubugimor.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/dukagokok.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/66209453794.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/lmsose2am73fnomhn1r00qjdnb/34501221615.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/muwevikimatuzuzenevedabus.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/23845335784.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dc12a75b---xoxinemedagopisojomutu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9iq5d2car4pn84qq5d7o68mlnh/bokozusobividi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=romantic+movies+english+downloadPDF 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_off000151f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A03 17336 bytes
SHA-256: 92c637c043566802eef73caff3fde7ce17ebc6ced9226ed7fbad0c4de055c896
font_02_sfnt_off000196da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196DA 10916 bytes
SHA-256: e52e7d76e1fae977f3ee3a8ba4eecee0017b86e0f7ab30a535cb277f79a1446d