Malicious PDF — malware analysis report

Static analysis result for SHA-256 55071fc01ce9f1f3…

MALICIOUS

PDF

120.6 KB Created: 2021-08-07 11:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90699fa1feb8f7d86c8fc9ca097868fc SHA-1: 5c33d479cfefdd7e01dd3f9bd20bba740b922ce1 SHA-256: 55071fc01ce9f1f30a18bc8ef6b5b3ffc728a2d7f2d60c5102302d3917cab70c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous distinct hosts. The embedded URLs, despite one being marked benign, point to a pattern of redirecting users to potentially harmful content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alrehabourhome.com/userfiles/files/wafosanivopuraxifipuriw.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdce0e854---44738983664.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lvp1aenf8f3shve6ot9e41fcj5/tofujopitasakikolawevu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0pt36s2sklp37qoov403kra394/86848127641.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/41324390387.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ee4d01b5ceab89305c2c3600a5448cfa/lovozuxadanuramoludanafi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b776ee89ae5595e59e295691e278f144/7562989386.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365dc996b9---sosefanexo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/68520709523.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/dolutelovif.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/35852886283.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/tobinorovek.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbfe9a132---sipepunodi.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/sebes.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077594db9118---matesixoxaribabigijof.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e18093fbbe86b3540ab4bc9f274f51e4/38100832822.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a863dfbc4a6---subirutogovilagotedaxodi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ettvjqfp2qhiunei946kuvg2sl/32194325872.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/61006605908.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/3037846106.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882b8c3d33f---zasinitosufujelomada.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/676ef5583907a41a049e31474b1bc887/xepuxit.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/64064296820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=newspaper+report+writing+format+cbse+class+6PDF 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_off0001757c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757C 11196 bytes
SHA-256: 37fdee60f3cf3d8a5ae69c0b14bee9d3ce5482aeb72813f52fb5dd381ebaa988
font_01_sfnt_off00018f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A5 16924 bytes
SHA-256: 4e58c046be0c2eb49d0c5089b22d3d171bef7aa19ebbd0d90a6bbdcb27b96d1a

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