Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eff174bdc940843…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 08:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3d98562cd9892d477e5cc4ea6208a85 SHA-1: 8b4b7aaa0ee2dda426ca3fd69197930865461c2e SHA-256: 4eff174bdc940843809308d3218697d4b937be51320495e48c53a79c04cf81ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links pointing to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phongkhamthienhoa.org/images/files/53011288683.pdf In PDF document text
    • http://gtlmarinefuel.com/userfiles/file/neforakivejetoj.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/47726025186.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/kexikulubupuwa.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/suwolirebafogexuvisuk.pdfIn PDF document text
    • https://coevent.ru/upload/files/loviramazegewem.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/70234821167.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mixugar.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd2971564---gosobusarejoko.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/35361830522.pdfIn PDF document text
    • http://scpt.it/userfiles/files/49755229992.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/36382086721.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/tatepubiwimeniximopusu.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/nuxavabelunozefudi.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/5233026298.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kovofosusutabiraroragosap.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f5e3d86b621ff38032363147971d8315/rilulaxun.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/48705970550.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oo51aaq5bp64q7vs231g1rnvg7/84404988786.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/jovujetoworegatunes.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/34878979190.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/81692550660.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/47503938615.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/36874399172.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/40382798690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wst+snooker+game+apkPDF 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_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10544 bytes
SHA-256: 5cac5f956f19d8be090b6bed711c5f799649fc94f3dd00475e5786663cfd833c
font_02_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 17612 bytes
SHA-256: 7e071fa110207aaef0be379dacfa7adc70d7986703de1566366dde420f383b15

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