Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af8c98e1e9f854f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 19:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a19f27551acc448bec53950843fea0d9 SHA-1: bf2a479edf02e13d0e3bcfc68b2a999b8c5bf4bf SHA-256: 0af8c98e1e9f854f52e35d09caf0d6bbdf17018e8aeacde1216cb8610f26dde3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, with several identified as being hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=solicitud+de+empleo+costco+puerto+rico+pdf PDF link annotation
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36319018465.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02ccf1ce0---75168369115.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18934116115.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/22907308937.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72c0910f---zavapezevonejitawesibe.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/22360837242.pdfIn PDF document text
    • https://5udua.com/contents//files/deditimuzowura.pdfIn PDF document text
    • http://runo34.ru/attachments/file/59268715851.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wazunigulugamivanigi.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/bemaxitituke.pdfIn PDF document text
    • http://minhanh.com/files/42483236357.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likefolulul.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5313924d2f6d4eec56e40b9446ad6b72/povubokufolubuje.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355d85e34---33938920627.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/41381890779.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/pemoru.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/79056695196.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7d4f394af12e2d558420bf057532f2e4/suduxi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/rebinominuwidibolu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077314eb4aec---34812512842.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210612112919_ecg7nn.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078267b92dae---leranisolaxe.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/pisijefobexujopezeja.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/xizewex.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/8353361e3e9b40933f69e4d002158e29/65630834071.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
font_00_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 19180 bytes
SHA-256: ebb58dc9a8991e5437ae9e4c0596e3c881f98974e7511fd21743924649f4de5e
font_01_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 10692 bytes
SHA-256: f9f15ec54f8d8499fd66dd303a3e0a3661c95c8f5f77c6355ebe9757f7847484

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