Malicious PDF — malware analysis report

Static analysis result for SHA-256 529132235f6d2733…

MALICIOUS

PDF

99.6 KB Created: 2021-09-08 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3111c9e5fb1a1d287093c4ee5a00a30 SHA-1: 775ed274d75aaae203e94efd1c346bceaeebc128 SHA-256: 529132235f6d2733ca67b86602c662bde7d7531c33ba890ed4455a21753fd2bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and compromised hosting suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://reklama-v-sochi.com/ckfinder/userfiles/files/karix.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/8495603540.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/73897453518.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a7d60c6028a3f8221b846fc895b20f6b/40841507237.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/161dfa1e470e23afff594c29788b0113/pajute.pdfIn PDF document text
    • http://www.heksan.com.pl/file/84075336505.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e859a2759---lalotovovizanofiru.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/083120f29c6bff2d7d86bf2aab0e38ce/29011700315.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f1ba05c---motev.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dolupezoravi.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/64773991369.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/lozovafiwazajorew.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/39635945052.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/fufexalub.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f499e59da3---34423758474.pdfIn PDF document text
    • http://santeh.md/img/files/32976875360.pdfIn PDF document text
    • https://mkart.it/uploads/file/31340780190.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd474e7d8c---92367562795.pdfIn PDF document text
    • https://msvadba.ru/files/file/gonikitatojonemafawapowu.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210723090232.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/21398980007.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67abebe50---77488512336.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xelasuvezumemikovimal.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/67477967623.pdfIn PDF document text
    • http://www.polni.si/Images/files/80997016441.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b92903b7c3---benililasikemikamuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reality+distortion+field+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_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10652 bytes
SHA-256: 657e79861d5000a80d6890da947c43703d93eaa7d54b66b24f26edd758baaa71
font_01_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 18340 bytes
SHA-256: 02583ace4e57542ef0497dd4aedae3901ce2a857138e17e7707712ebd01d7877
font_02_sfnt_off00016872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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