Malicious PDF — malware analysis report

Static analysis result for SHA-256 97813b1d1c1dc261…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ebfd0cb39311214cfe1f84a5f15f030f SHA-1: d275e00dd2f866df6fae03413021e1f892586d45 SHA-256: 97813b1d1c1dc2615dcb185e954321de32f0713c16e6c7cfc35a6c56d12d638a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads. The embedded URLs likely serve to redirect users to malicious sites, facilitating phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788124d3929---fasujonemurezase.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/e414ca92d413be6924f7ce346fa64e58/wisenif.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/52bsua86gr6rhhs072tmbtakd1/befawo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bsssntpmf14l4qofvcpvaghho2/rigimuwolawiposizida.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/16023276326.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dekobapajor.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4f8cfb9b---pilitibagabarelinux.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/08bcaa0777ebf74c729581c229401890/darejukinotoxizus.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9684f2a06---boletedafisatu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/18233415458.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ieduei2gpr7lc8i2060rg0cubf/lajesesatiti.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/n5ssjdugaapu93ib2qiiu20fl4/rowileninamefaxenojodawo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/patimavenupol.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/vnegtghqs0bj2hr4tdq0rvggc7/gimatoxijonobazufi.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/p4jjbho6kajc7egsqd7ugho1bu/60176688965.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b59d30c6f84b5e19d354d9ee46e1b18c/84635142479.pdfIn PDF document text
    • http://ibb-online.ru/f/file/moledidasa.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/bibupanofileju.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/44f5705c8c929570ff5ba4f0ad9d09dd/xogemikolugusakowegax.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf74c9570---piret.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/031af88ed67d14ddb4e88405e62ebd30/76810187571.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679f6431f7---gabiril.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/16540610297.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/42185848967.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/97067340689.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ac4de943---57963617774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=after+tb+test+skin+is+redPDF 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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 17944 bytes
SHA-256: 42ac2b7d331a445ece7ff23b652aabef5a6e3bc9195b494cfede494849b3976e
font_02_sfnt_off0001399b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 10232 bytes
SHA-256: 001b7c95953d8f50714871cd8d4cd3defc75014ab51044e78adcdec9a487c9a8