Malicious PDF — malware analysis report

Static analysis result for SHA-256 924b4b65bc464333…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 13:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 567a5d4e37bb72b8e03c47a3e5bd10ed SHA-1: 463652c1782eddbba215868f08bfef64926fc894 SHA-256: 924b4b65bc464333647b146369aa1884b13d2e562939589d6f793feac1ced2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm or redirector. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2323ba80cffcce93d9a4e278e67fea28/zegerajunimenu.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d873e737---ripafopevilolivuj.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210721232509.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db2c296adc---35390220212.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210803_2C0B9C0FFCA97CBE.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/73946383086.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zemodiwagamiweleliw.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/68131874914.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/61192103032.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/72127278636.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/a3qoflbdlvvbo27c8pk98f5uek/10063024440.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/xakoxisobolimuxasupimafa.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/wasepekaxenelebugaxiga.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077075e57ca3---sedodilirab.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/kajujonotudirul.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/xelilekepaw.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/kuvufawexunile.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/tanaropamewukoxifan.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/80336356276.pdfIn PDF document text
    • http://vnplastic.net/upload/files/14919611801.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16118cd566320b---2001628485.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d906a7ab9c6---21131596854.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e225dec43---12541301573.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee62f6aa8f---24283586001.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48460136195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+taoism+pdfPDF 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_off0000b74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74B 16536 bytes
SHA-256: b2bfb38712b3dd9a0a71b949dd7e0f101ef399e867458a0470925869768f02fe
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10372 bytes
SHA-256: 93f5f4c254f59a788bbddbc697f131c3409b3eecb8a3056c0a3c068a77aa530e