Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b4d278806a48c6…

MALICIOUS

PDF

99.4 KB Created: 2021-08-12 12:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 978c3ab94e274b24260fafc4a80c882f SHA-1: 67ce49db370d27fba563ad6bd572a15d5df0f098 SHA-256: f6b4d278806a48c653808671af21e3b345dafeb0103594cba039b8d4e2ec9e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://aftaplan.com/works/peepsparty/html/upload_files/file/31535972623.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/bimilasonivagevas.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160781d3d9fc19---rixusib.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/90479b300310c8d130239cea6a4ae11b/90545766377.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4bd65b507a7e2af63a9efd22f9e9697e/25898667103.pdfIn PDF document text
    • http://carszana.com/image/upload/File/86582383745.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/77139110419.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabae8026e---23678855434.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/napasawipaba.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/46250376863.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3ca5d9b918ac0d741adabbf5688f49ba/64350039793.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/55356618291.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lidupipufuvowavuvadi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xumilepu.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/40591782938.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b4cbc4ec2---ruzuvufanugapiwuwakoxuzoj.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xanox.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625255188samaluvobaxoxamovulum.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/78325013147.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8bff24690b2529be0084b0cb99e6da32/xusipofepakasapuwoleler.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9d34b6f2---mesubo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9hv8tpchm54tji2eucu4vdb124/51332610419.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-27/20210527165209129297.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/tisusisoduziroveko.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566dd6dfe1---zetajeboninow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+numeros+complejos+resueltos+universidad+pdfPDF 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_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 20784 bytes
SHA-256: 65d51e2644f109b4213ce52c9d157eeb3e1e870ef3d876150d5031b2a735b798
font_02_sfnt_off00016315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16315 11060 bytes
SHA-256: 742103593ea1f199e1dbc9985ee01715129d0b35759cc6d05f42dcb0b23ed1a9