Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee8559dc3234fc1…

MALICIOUS

PDF

91.9 KB Created: 2021-07-25 03:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d3aa931aab7cda8ca25bae2d5beaf6f SHA-1: 32d9de93700db18d8926c76b65a784e3ec38c396 SHA-256: 8ee8559dc3234fc1ac0d014d33365f52b74d946834de61245c660489caf491ba
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, leading to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/862nhotq6n5papkifrh6ij1qf5/gibuvusaxobabotidugu.pdf In PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/73e99afe8a83697d34ef5ba092d0d638/6320822784.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/sunawoka.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/peweguzaronilaxexu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5557b1ee---59684338219.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801637a413---lowojavojowipape.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0c18cce6---zudufofaxaro.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/wilugixopuleloxoziregobu.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/pusajopuvozarenaf.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/00m13lttdihsb5rcil469jvt7g/nupipekesifale.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fb14648efbcbb7081787165b9bfd8d05/fadunas.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/sitotuvurasigoral.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nugalugelizuxodut.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/koterusazej.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/fuwokokeguvenisokapigiga.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f01e600a---77666275575.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c342187f8---89215432183.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160813b701daa6---jupuvivedizawufonin.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/30508420444.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c15963676---6500281187.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3cc3a6a2f186b0ebf1a398646b210fbe/ratamoko.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gimefozawelit.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/331fbb6158e48f12bc8ac5baf35f02ff/24765617652.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/baxekazujesamezamalapow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ucla+waitlist+2023+college+confidentialPDF 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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 11056 bytes
SHA-256: 83ddd098a20c075a3ef6fb73a66513f945a13eaa657fc2348441037bbf4fe34c
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 21220 bytes
SHA-256: 26bd579b00b0a88adc3e66a59cedd8e7b26413bdd0958b95c2e9dabc0e5a222c
font_02_sfnt_off0001480f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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