Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ca23d8eb224f63…

MALICIOUS

PDF

104.1 KB Created: 2021-09-02 08:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 070229288fa9c1d86f43340a6f32ebe4 SHA-1: 399ed597f0c5a5c5a9472ec69fc41130fdb67443 SHA-256: a4ca23d8eb224f6384854cd2425d5d986a940e3489e50156e2ec9ecaea8b81a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bea7c7226.pdf In PDF document text
    • http://teleinwestor.pl/userfiles/file/galerexodajijurajobeperev.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/dunifememud.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kenabezurasugetenedijam.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/84626243167.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7029b2263---divaz.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///78122857527.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9fb683fa93e74f847e6c506485ea3912/mesobimeruvuvomifalotis.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a674ce531c---bisoduna.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4b726f09---30862749825.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409eba67c8---fabanudirebifirugo.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/79115826473.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/magev.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840665a49f1---61320303010.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/67751577500.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/56182964821.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/13533840467.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/12ef870815a9a12cea94e73c2383573e/32389943060.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/jozufiveragipofogu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607916cdb23a0---13724418568.pdfIn PDF document text
    • https://andrejc.si/files/file/tujutijomevujiwela.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609041b705848---vaxodedirupegoberinesa.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/96bbe480adffcc24b7112261e30bb079/ranixekipapiruvav.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609092bcdc378---78485031637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=does+dehydration+cause+low+pulsePDF 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_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 10912 bytes
SHA-256: adb99630d52de0cfc63f48fa7f51ae166b5f675a3c56af38844340d697787579
font_01_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 17960 bytes
SHA-256: 6186df92f9147a56d0c86baea62829ff0d3b48699e2b03034ed737d16a3725aa
font_02_sfnt_off000179c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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