Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662962d3dba26d4…

MALICIOUS

PDF

93.6 KB Created: 2021-07-14 04:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1577947026210493d8fa9e55339776e SHA-1: 6ec710121a2b7ec9558c2ce354e38d8489b0dd7d SHA-256: 5662962d3dba26d4bd15d62a4475597a0d258cef028da34f5f1d3e10d3d754f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2abe4bc1d---dejub.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/4899145486.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b51aa15725942d6cda61adc4beec61e2/10550398354.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d66d36c5a4fc307307295fdc22788279/wexupalefu.pdfIn PDF document text
    • https://securitydm.com/slicice/file/35367760434.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84433710259.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8836baeab---vosuter.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/48158794110.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/7035941379.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e7482c795---lodijedenawujosobab.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3871a74c---96497312087.pdfIn PDF document text
    • https://edusfera.pl/upload/file/sifupubor.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/fimopiw.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858c67ea2a5---51034961786.pdfIn PDF document text
    • http://siembra.me/uploads/files/60970818480.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1a7388fa7---27741970557.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/62701708648.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/tidegorutom.pdfIn PDF document text
    • https://tl-systems.hu/files/files/41395851251.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e176f53508---nixixitega.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mifesivowejaxereboxekos.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075457d0eded---71367627485.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ce3eb5f1---40978707051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=central+neuron+systemPDF 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_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 17372 bytes
SHA-256: c8027b0d660e6f698c767345c8f42f7d974284ade5b7dfb2f976aac0eea2e493
font_02_sfnt_off000151b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B7 10424 bytes
SHA-256: ed8fcd342346a0f43d23f10a6e5e409eb873bafa19b071f73ff0de384d813e88

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