Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da43f21d51f8ac4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 05:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19bfc11d6536950f9f7442cba5f9ae8b SHA-1: a694e858a9eee19a99c813a164a32a8a5de490f7 SHA-256: 1da43f21d51f8ac4c740e882c8175dae144d33d7dc9cb760eabe77976fb28f83
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eef361a71---kafozajadipisarerupexefe.pdf In PDF document text
    • http://gldbirdgel.com/user_img/files/1222084172.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gosisedare.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145921b49254---53396533629.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/88372290027.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/28751557628.pdfIn PDF document text
    • http://cascad-trans.ru/files/nonubamisupuf.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/33329628037.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/sefonenawes.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zaneliruzegas.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/pobosunab.pdfIn PDF document text
    • http://hueide.com/upload/files/84195626280.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/zebidaxavukokevonilel.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c73747d45f1857cdad2211491e88feea/nuzaxomurot.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/diwafepivasoka.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/40740783755.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/vavotazub.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/37793777424.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2726b8d4f348438f549b9ed08a67236b/sozipuzopowananenidixize.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/nukolixitetafojibikeruk.pdfIn PDF document text
    • http://fpole.ru/sadm_files/29998112547.pdfIn PDF document text
    • http://sergeybazarov.ru/file/gifebibefikuxuvu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/dejazake.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gosanomarabokivevuladivir.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevekekapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=justice+league+dark+movie+downloadPDF 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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 18224 bytes
SHA-256: e25a89d842c741f3a00226424bb97cb4c7e69d0a0937f7cc13632bf8f6401bc6
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 11048 bytes
SHA-256: dae6b0101f89af50995c5e734aa1bf53ed7ede554ea66652c95158c0ca91d89d