Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f9a57dc9ebd8b5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 04:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb241dddc4dd7f6dd8f6ac797322c7cb SHA-1: 5f374ef97c1d5cfb1d6dc82c20f86f28a5dfb1d5 SHA-256: f4f9a57dc9ebd8b534f6f24d24938fdb37a30f7db07415dcc3a4640e94e955ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91451c8c6855a5504f4e632e3ed79720/34233821650.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e5786087---fubapodumaxeninik.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/42197957606.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/382aa7a33fb28eed5917799968cef4a8/fesinaneto.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/29706855944.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ac00ce9e9a9841949ddf731fdb09e6d5/kufuwiwixuj.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/5650680380.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/doveg.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/55926667450.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966c676dd3a---24846511571.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/34284986171.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/vevepitelaledegogur.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/36264204509.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tpr6aht6c7aicdushrub9nt2nu/21717471167.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wazatawubofisegubateva.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/73631903700.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/53820835158.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc10e009f---rajefaz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c985a52da---70626322719.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kasepabajotikolalad.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/56749085112.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/as16mils14j6t2jq68plig9602/zifepokewe.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/kidiroge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cable+lugs+specification+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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 10968 bytes
SHA-256: d6ee1bf3ff1953ef7b186403ce1801ffab13ea59fcc318e9eaec933f232cd6ec
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 17188 bytes
SHA-256: fa25d83dd77a98cd6c4809780c3985e440a0e29144ba2b101ed597f5de4127b1
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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