Malicious PDF — malware analysis report

Static analysis result for SHA-256 11aab46cdba548ff…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 03:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 636a0e3d2cbd1cfa20a33a2830b59ee6 SHA-1: e8a0a50536d879a5a42025083d56c7f834768d7a SHA-256: 11aab46cdba548ff9c7aa31a91f8821cd767de66e65ae81ff035f4da01aed0d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=need+for+speed+game+mod+apk PDF link annotation
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210923180206.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109250946532561.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/puzipujenegexiralurip.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/befisarodiboparunin.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nifomopezod.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/62682541193.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/25038498146.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/73236807627.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/56207924556.pdfIn PDF document text
    • https://mlspoland.co/files/file/46137608883.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/69614871278.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/viredomogebid.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0af2dc8ac---69471737667.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/24351683289.pdfIn PDF document text
    • http://juncheng.tw/upload/files/92694320086.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/68327331422.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/47613372222.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nememuxozisezepunevoxu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/fovowunibapodulemuxi.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/tovemelizevigolijesedu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wuzuv.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/19e84604e3da761c16fffacd46b11e77/sixufalexusurajudutela.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/28408447255.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/25875703456.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h5kf73lfn410j29eh0sl5p9vj6/fifelorute.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/porerofatat.pdfIn PDF document text
    • 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 10572 bytes
SHA-256: b00bc19148435fcb6b4de6da56031296d795b8ae6f8406a2c84e37abeedb86d8
font_01_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16144 bytes
SHA-256: 470facfbeae0caa4a4b4e3a565884fcc5b52199a832eef46b004540e1ce17216
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1