Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da8b371ed721c7e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 04:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3732a507e38c522ec1bf1ba708b8b92c SHA-1: e06c3bbd1c5efe11fcf8fdc0576c6ce48b298d86 SHA-256: 9da8b371ed721c7edbfedd3ee66b3588e0891302df441883394967eafa7a694e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, indicating a malicious intent to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079869516629---jukewu.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5279c3c57645cb13c74a5b7ac395c104/sirotuxipezovunebofe.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/52998719437.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39b5bb828---gatoxixuw.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd67b93fcd---lamom.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/85678356456.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nikabinovuzafolojizifiz.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/e96f252454c5f681c5f03cad995e0fb9/xowokefumemigijijumozu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/mujivopo.pdfIn PDF document text
    • https://invest.pl/userfiles/file/ganapuxoronofiluvewafoni.pdfIn PDF document text
    • https://naoshima-habitant.com/basobutolabob.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/bopufenefusesejil.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6aee2215e5ac9a07bfbcc147116fb975/nowibuv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160944657cdbe9---29780261038.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/22535119025.pdfIn PDF document text
    • http://watch62.ru/files/files/zeravazaluxasalotuxonada.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607753fb9f263---vuvisesuwaxez.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a953ed60b00---fepudolilepisimaxerolaj.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/64390929713.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/9606171129.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/vamidasenuxupero.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/jimawulinizojevaleza.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/72749668046.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/zitimugijabibitelu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/90711525321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=checklist+before+driving+testPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 17132 bytes
SHA-256: ff426ac40227d78764485d304654e96dbadc01d8514d7e7d48840c6463a17692
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 10920 bytes
SHA-256: ef75a410f559d646a9edfca244ad49a6c942610e6a4727d0bb2173e23e4a6e73
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1