Malicious PDF — malware analysis report

Static analysis result for SHA-256 b892de98aebf152a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 05:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 770f26553fa981071a8a538dc0a2ef45 SHA-1: 86f2d93b029bc3a4d5c27f4e5f6ee30df805a4a2 SHA-256: b892de98aebf152a363132763b6cdd87bcafb87e09c98d275ed6645f102156e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised websites. The 'SE_CLICKFIX' heuristic suggests the document may contain social engineering tactics to trick users into executing commands, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/23fc3cf5a7f21947d01fefa0933dcb81/boregutobama.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe53a7a2---26492051443.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/79174505217.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/13373518142.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/rusuzom.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nexesula.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/61089091076.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/90923366399.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/37475093165.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vefevelora.pdfIn PDF document text
    • http://foodchemsino.com/d/files/zamapoduwijitipa.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/5518604161.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4ed3043cfcca987a914db843883ec03f/24951952420.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/julof.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6333ddb5---bobamibavibulesabovobib.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/56272648156.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/31670865596.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/682e9c2d4feecb22a845ec3b7fac5dd2/98396128961.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/pafufatijomawisap.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56264838499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=prioritize+wifi+networks+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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 10540 bytes
SHA-256: 9deffb624fb1938cfc5e06eb86910e5dace0b2d624c68a20bbcf4350acf27e9d
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 17424 bytes
SHA-256: ea25345919a3256258e0215f02e737a9eb8ea9073f012c51632046722d4cdc7e

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