Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2506ae4ef214533…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 16:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 251f848a9e51cc8ce43d68bf0113071a SHA-1: aee81574d1d1f2682d6cd926c0685d2456bc0ebc SHA-256: b2506ae4ef21453357c035a3afc68ada89514a5437af174ba20f0a1e7808fea6
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 ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://maggies-handmade.com/UserFiles/files/58764057310.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc29849a9a---xozimage.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/fibetona.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/14298481734.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/nuzajotezeritugeb.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/7647704488.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fapebalevupipepix.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/85965779149.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/86570203758.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/6759578535.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98bec1dd6---ribudodatapizudaxak.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/pijag.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeginomovovupekupokifexid.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/92873179433.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/72488066750.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/winilusasisitameromotes.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bijine.pdfIn PDF document text
    • http://arucax.am/user_images/file/nudabulisenofitapelexelo.pdfIn PDF document text
    • http://iviltra.lt/images/files/gisanov.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/13785738608.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/dobaberepezubabe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43848b6a4e7b62189ec34c975d6bec9b/nanupapovufurigefasabejo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/kiwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lidl+plus+app+for+androidPDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 18056 bytes
SHA-256: 3b8ad5201779b29eef934674a157fcc4243e5eda0abd5d20b7b20fa7e36e496d
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10320 bytes
SHA-256: eae4d969e645328ec9e78f998ceea6e8d20857155dc7349956cf67929ee6fcab
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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