Malicious PDF — malware analysis report

Static analysis result for SHA-256 85066bace6dce842…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 18:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1439951595d958d4d2d88d0ab373bcde SHA-1: 3d9d5213e68dbcaa5a6980de40b861165b678c80 SHA-256: 85066bace6dce842775709f2cdf3364c6a26b548df88ae6da8c75544c9478f2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://manpowernepal.net/ckfinder/userfiles/files/27062286808.pdf In PDF document text
    • http://finara-v.com/file_media/file_image/file/92174547672.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/dalizimeseramuwemojuke.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/ginezozasedurob.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/dizukufozadizeki.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/59566392700.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/73320339019.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210921_8984229CB245DEA0.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/wafasinagegajobunod.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sesugixidaferixaki.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/gewimolenoroburubuvi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133de9aac2e2---48806216071.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/jugirizovoxus.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2vrda5mvp55gho5sgfoa7n9p52/49609401229.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/pijovi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/54129763505.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f1189d79---kusozifinimujap.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f17f737c5---99198723583.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sabomi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62615795784.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/83051933744.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5e425542829a6af7e806e9d519a6c350/45406758281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manga+renta+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_off0000c063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC063 10084 bytes
SHA-256: 5d6a83ba61fb0fb5acd07d28b2c0d31123075c618e3b680dbc504b6dff8fc591
font_01_sfnt_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 18256 bytes
SHA-256: 3b7376760bb474340c6b5448996aa97bd3370b7069938b65b6f4a47bc7cd248b
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1