Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf927da0ad4fdf…

MALICIOUS

PDF

96.9 KB Created: 2021-08-22 02:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c13d4f8ccc793fc0784480cd419c137 SHA-1: 88ca832ed980b1de6651e5c97db84f5acde4cdc2 SHA-256: d6bf927da0ad4fdffe8cb594e75fc4d254f34bbb8602092e73b174a0d14cb8d6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host links. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sasolution.kr/userfiles/file/nutewoxopabibiruroti.pdf In PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/kotagadar.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/59947346071.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/49227726632.pdfIn PDF document text
    • https://inncredel.com/uploads/bojivozufili.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a13b0317---venasanatibozewed.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6303276767---gunugovubowobalotosofigow.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4kfmhcd5gpd8nkpb1g4i0s1dhm/22577300874.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099b14f82386---70564245270.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/93958427312.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/patasusiwalimevogafes.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/45364717536.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/26699932914.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3katusgb7etvluq5fr20drtja3/pefapimarinadifa.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160721d54aa84a---5202669563.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f904d9f66c---63920479431.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9aa3f7473a1603b6d0350c672ed1e5ef/37207527967.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a621aad354---96526717382.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078976f29054---67171479063.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607875bc1775d---mutedapakemidokuwubej.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba7c92df2---96754218428.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/hjkt7g5n14dnv2a6j0hpas63cb/88705284952.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a326eebb3---kijodawovojisejifanosaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=be+filled+with+the+holy+spirit+verse+ephesiansPDF 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_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16956 bytes
SHA-256: 04a9826119ba1bfbcdb2060b35cbfa9d2d4ca1198c1e07e28836a7ed28783f05
font_02_sfnt_off000159be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BE 10912 bytes
SHA-256: 824b3678db0c683b0d6af977fdd05b6f13b7d956e35c07754a3198ec5b99e85d

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