Malicious PDF — malware analysis report

Static analysis result for SHA-256 116cbd839e05c4c0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a17ea4c282dda881bd63cb7ae73953b4 SHA-1: 449f01417b9ef3f22b6f259574c5da0534514e39 SHA-256: 116cbd839e05c4c0dc0bbf6c991f7675e2be4605b17f80dd1ce66c81cd80bcbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links point to compromised WordPress upload directories and disposable hosting, forming a link farm. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a586734058dacb89aa94634c7668ed1c/89476988365.pdf In PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/12575522160.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jepalugudinezafufapofak.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/muturuloroxono.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4a971eb7---59993236521.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ec559688---85582629047.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/69218346146.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe0d1c83ef---59473583614.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/52656266247.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gedalutefosovologul.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/9422973691.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/89ej7tgmhg33c9lvohkamtp8pj/97301306403.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/76241341907.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad62fd6a59b8d5ccff82c971ba85728/gufafi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91dc95524---13106536343.pdfIn PDF document text
    • https://rjpexport.com/files/setikudulejowakatiluxem.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vodujojaziwenugifuvedi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f44e57db167326bf201bf3a8b15a0a7f/wimuter.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/tixinurokemaxixizusasu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e71ba4b---74172582117.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/79971465512.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/63024584292.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/35ab429dcb0fb9238d00ad408d27e2ae/gufavepukunujezavebikaw.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f41b79583f66be5ab859bde34b8f3756/89618753036.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0f6a6065e0fe703d766de8c20396d8fe/21405299975.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/78a2a487776a57ed48205a5f99310f3b/xolowuxidarikopelebelus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=herbert+marcuse+biografia+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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 18820 bytes
SHA-256: 41055f46397794660239a4cb07f4ea612cb74504c7541e97be43d3a4549fef0b
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 11044 bytes
SHA-256: 276dcc717ee512e2adf12a6e8b45b4cf65a6ee6a1f5161f72c9dd2fcad02ac4f

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