Malicious PDF — malware analysis report

Static analysis result for SHA-256 945c21c895403cb6…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 16:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42a0a7f8ea2c8fa7cbb589699f7844a0 SHA-1: c8ac9463862b01b7de6f7022642d3a462d7bdfc8 SHA-256: 945c21c895403cb6dbe7344e732dfa846fc7600eb6f93e0e6964bf24c64d17cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as landing pages for malicious content or phishing forms. The use of compromised CMS upload storage suggests an attempt to blend in with legitimate traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=watergate+allergy+and+asthma PDF link annotation
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160949c5f3bc00---votidadibifajesiludiraf.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/47cb9311363d5dd1fb34fa77140cb599/59269590782.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/faa4ed690710e250d9dce71075f30b49/kaxezafokesuzo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/80e07773e05456ccb5007ba3a6144c7b/xafirovezafeda.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/51724552517.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ff2kqceg0ljjkgmtugtu3ghhv4/varifukibaxediga.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d03f8e17c---90689534890.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d819665ba---41906966103.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/vavuzevuvazenelapul.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2c32e45678502deb910c46b27172cffd/wakovasofanesotevukuladux.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4966d3a2---45259234170.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/21102546338.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/9959742351.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jaxegitifer.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160785da2e4c40---36527269077.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8faafbea5fe39f1e4bcb39b337225c77/83223982319.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/natibatadejatodobuku.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/51495658829.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b72e8e44087f0a4276dec0fe10c9e1e2/vuwutopul.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c79af3eb23d---81147929915.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/vofumimasuzamofukodedij.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac2d2553---temunalaromikusodefamop.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952340da331---91300948529.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
stream_003_off00010f27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F27 17416 bytes
SHA-256: 4198cbe06020d12826b5ba27d85ab621305a78c6b57b8692b3b45366e504e851
font_00_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 10588 bytes
SHA-256: d2568e3e5539e4140da1532143fa0dbfa4659b39e04f47ac1fc44eeb13939092

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