Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53c095433637a2a…

MALICIOUS

PDF

79.7 KB Created: 2021-07-25 02:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88e6082163bf681d54da547652b8326c SHA-1: b68df8ffa3a1f767ff200f951a37a2e4471d1d7a SHA-256: d53c095433637a2a41e260d6a10e9c24569f2d8acac2c7a048b9895bb90dfd57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to potentially compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://wjvanderheidedienstverlening.nl/uploads/file/35410577496.pdf In PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/90q6os5qkrf0nc7ub58b811mjf/xilakuwefamakula.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021518212567065.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f5dd9fb754818710016271ec405d663b/39301835675.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9c6050d9---nasizisiwolavasagipaber.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2afeeb898a---tilikabunawifejuwik.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0fqsla0g76pa2gn75a9msknum/lerosuj.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/59488734443.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fitonewepa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835dfeee312---bawovosabawuguxejunirefo.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/42352785179.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/95241973028.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ac3b84386---xezuroveguwolajuv.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rijewagip.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/digot.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tnhdootnve6v52anrosrq533g1/29153216928.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/duxiwonipomajimeteguder.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/26631337153.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/xitiri.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7703438ccb8f4a811dbff6bc1a94ea16/90191749577.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p0r6na1bc471dgnpeudk9o1mi7/14776531854.pdfIn PDF document text
    • https://premium-house.uz/images/file/tuvulefuraxedokorike.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/i9m9u62ds5oaia12a3cnts6j01/woliraxunobipaxebaranizon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dicks+sporting+good+hours+altoonaPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607399c0e5e19---38048741123.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10856 bytes
SHA-256: c43e81db6eb0d5b33ea8496db22755c99a078c4cde3edadb492517804845ae53
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 17188 bytes
SHA-256: ca68e213cfa1ca26c72ec4a4fcfee9fc2f4962fb74ec76aa97830d073ccf6f97
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1