Malicious PDF — malware analysis report

Static analysis result for SHA-256 c440e74c27d6fe80…

MALICIOUS

PDF

81.9 KB Created: 2021-08-15 21:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3a79ed9a8af368cce9d21e29e4a68e8 SHA-1: bbfa7c7c08e44442c3c67e3fce19554377bda3f2 SHA-256: c440e74c27d6fe8079b17948340602e63da2254a451315699326747fab4740c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. These links likely serve as redirects for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160795b0340be7---jilapijelopatunodevumafa.pdf In PDF document text
    • http://archi-m.ru/userfiles/file/bivuxadojozojoketivejux.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a480b4a7f10cf0757e9b43f3605aa9e8/diwodubo.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fujal.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/fotovilesavub.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160921f5559180---73218582271.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r718tfdjfrkt0f850smjpi11ki/fejenelisawogitiwi.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/tozapogoduvifonaxuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1db7840e45---bitiderolo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1460605221.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5e5cba201e340ed71136203f3810fc79/37932654851.pdfIn PDF document text
    • http://rcot.by/pics/files/megawotonevedeb.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/44059308577.pdfIn PDF document text
    • https://afayl.com/userfiles/file/16933619554.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/90380645750.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/wadetunufiludonanolaxafek.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/66559490923.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jikov.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/513844905c5d775b4825af7871aaf0cc/mizafix.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/725116ccb34da5a273af8efd50a779bd/wipupeso.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866ae6e6889---jonefudabudigogipilipe.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/0tc5agcofljv098lfval7j3a4v/todulazoxewelopibufagos.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f830bd7d3---3838388130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=guion+de+pastorela+comica+corta+para+secundariaPDF 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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 17260 bytes
SHA-256: daff973f5cbc5f549b5dc53fe4e6be1e0025c061a5e2a948eb5161be0cfd7994
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10812 bytes
SHA-256: 325706ab3d63ea22247bd7b1cc189cb8faa80f623da9efac5f38219ca987ed16
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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