Malicious PDF — malware analysis report

Static analysis result for SHA-256 955462914f577e32…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 08:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa0ef45ad8d1a2f883347fed2b59572a SHA-1: 2d5dd8cd2ad4ad110ab8d707f13f8eedbe279610 SHA-256: 955462914f577e32dc10f86ebfbe7044e2c328930ec9ee1405be45921cb57428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics confirms the document's purpose is to lead users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ca68c728---powex.pdf In PDF document text
    • http://chi-kara.net/Upload/files/55864210214.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/rekutikewupun.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/lifisevazukijidopugave.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/20131078671.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59178552184.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/20614971593.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c4cb811c---29830329576.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160711c0dbb092---rilajub.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/97822368184.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/64550056173.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/28429358152.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0dc8902246b262b0702a8421298cf063/54853274547.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b186dea---63303453647.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/59738367586.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fdf372836ebd4065b73e90775555b391/61293242632.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98257830902.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196446463048.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/18062597879.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/kovigosud.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/bojebosomi.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/37360630120.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/mujakamog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+muscle+test+psoas+majorPDF 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_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 18268 bytes
SHA-256: 45716afccb175d12d0a0dd4385566fa9c6ec9b0002a2debc52a993d662aa8034
font_01_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 10668 bytes
SHA-256: 945c2ef6fd862aee001b8fc1f01a78cf170ce46ab6874b66e9e7427b45bb50b8
font_02_sfnt_off00014931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.