Malicious PDF — malware analysis report

Static analysis result for SHA-256 624922257fe1c22c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 09:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69bbd60f8f6660cdcaf5c1d58666caed SHA-1: 1858faec6215ac5f6c9b2a10b38f8f28db3999af SHA-256: 624922257fe1c22c1964e8fd558f720b7f1b216b6701b80d3528d9bd7ad5908a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=free+fire+nico+app PDF link annotation
    • http://kancelaria-perfect.pl/app/webroot/media/files/49825909700.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c92266a3aken37ss3t9lslf3q3/valabogubifuxoxosolejud.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/20066057226133cafd57207.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/66220010301.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28776750094.pdfIn PDF document text
    • http://feg.vn/uploads/files/wozegojenabu.pdfIn PDF document text
    • https://securitydm.net/slicice/file/45639152792.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/78228111591.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/xoridezegi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cedd28a274---wagodalox.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/62srj8besmqvh5ge9e13v4fbn6/buwopimewewolasuba.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nttonelm4bn5cfc1h74q21rhfp/79149217998.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/19634233344.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/refeka.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/83603979763.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904072557.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/47282620609.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/61486098331.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/gewazanagalosudekifu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jiduxolaneluf.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/35108666572.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310d5e34736---girodujuvinejozataj.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/96601570780.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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 10140 bytes
SHA-256: 7ae21bec0bda8198321f2bcec2b57cbf8a71df8da815210d4a77e3ce4265205c
font_01_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 16164 bytes
SHA-256: 25e9c67d7692150210100c58e00a3dbda810548907e7737e136aca6ff2983676
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1