Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97d120e4128cf59…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 09:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4949a19fe14fdae7b30354d3c175f4e4 SHA-1: 8f16400b985fe06d1123a3fbb36457c35bec7254 SHA-256: b97d120e4128cf59febed874ad617b3b94115d0031def58940920faa5f9439b5
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple external links indicates a likely attempt to lead the user to a second-stage download or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kaplaitalia.it/userfiles/files/sakiripibisurirawusevi.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af5cc0f59c---kidamevibazapovudefalew.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wezoziwi.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/54440919364.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352ad606b89---71939589259.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/81833346381.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/aa5c34536dc6aa071aec1aa1dca4c5ac/revaboj.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///11226751837.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/59722420576.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/15613600201.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fb32b6834a384ba64925902c1d32132e/magojid.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/84505783164.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613b779ae43a9---pawumevuwumuredif.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/monixadubipirilogomap.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17705888586.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/panoli.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jewawalife.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/tapejir.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/binidarifufarugegesorin.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/35644005545.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/zivimowibojirozekevamus.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/fegikatexusuziv.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/lubirurajidapaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+apps+development+books+pdfPDF 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_off0000b2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 14348 bytes
SHA-256: 764b20d222c5646e85a09dd466b59e3bd501f9abe77fda7a82be7fbc9b269c9b
font_01_sfnt_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 10936 bytes
SHA-256: 12deed898e7fe0bfc5359256a9096dbeee292b72e849030ddd0515dc6831dcfb
font_02_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1