Malicious PDF — malware analysis report

Static analysis result for SHA-256 b010380c046fc3cb…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 00:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5d588260b23b9a58a089fc4ddaa55b9 SHA-1: ac560a16a6c2b80f0aa968fac8856728f27c2f6c SHA-256: b010380c046fc3cb9af2c6986c34b754af951263cb9065ffcadde2da628bb45a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee556327e07bce9fec104cc9b7e0e576/51216121392.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b3581c43---dodegetefasawozu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/678345991a81cc3953b8bd4a959dfb96/mogalevutuv.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/89728667811.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gofukejegowonusu.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/85212526642.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb8c42a12a---zakepibikebubepekazuxipaz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaa18827c---mipuderumerewazutubegozi.pdfIn PDF document text
    • http://placc.info/up_image/pozanutiburetugaf.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/19036458a3adf47c62172b02975a1e81/3620879231.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508ed2c1e8---femobakafotowibu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839b377fbd9---vadinubopupalofe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ccf321e17---kufaselujukid.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061404510480554.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823d984020d---24385973170.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0d62fea779202a144111a1f5a54f6cdf/vabururitanof.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/todumazoj.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/salamubunolodor.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/77818461984.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a6b2a4af---1170486571.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/6380798484.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e5933e4bc677c1fb479da58a939c0a8e/44514774212.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/fc0e64de5df7c576f074470550c97009/98091013207.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/sefebuxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+beakers+used+for+in+chemistryPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 17484 bytes
SHA-256: 661a49873dbee7d105316f6610b44bd0f1487382d587c9768fb5505f52d231d5
font_01_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 11136 bytes
SHA-256: b239cdf530b805d1ab8648b9aaffb61d648c07883737869fc808e5a20a494eb8
font_02_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1