Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b513397aacf540…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 23:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9901338dae131fe85938f65342fb6d1f SHA-1: d9a43f1f5ae282322f3bceecc3df827bca4d9159 SHA-256: b2b513397aacf540ad76a51a86bb4d8cd14fbb464cc826e4f08d62289e2ad3cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of 'advanced javascript pdf' in one URL suggests potential JavaScript exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hb1004.com/userData/board/file/19612704931.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6ae3abd0---kosujafegotinozovekego.pdfIn PDF document text
    • http://esistore.de/userfiles/file/rageg.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/sapubasogukekodun.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/74106271164.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/12396830197.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/478ebc14e538a6d01d6acc08162996fe/67786603883.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/10008567032.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/rexuxivobirokonunu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a43c20aca---6611083915.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/52b7e1e0e5d498370ff90f040c587002/17112089896.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/75314090775.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/97602392847.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/96553097804.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/31184225350.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/limazawenudumuginibotamuv.pdfIn PDF document text
    • https://grancom.by/upload/docs/mepuwuxowavikejevifipo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/tuburazevekitow.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_040609.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/21228604518.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc05e0c6---nidelavun.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/51213463332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+javascript+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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 17796 bytes
SHA-256: cf62b5d13daa28445061cf24c495e6b86d8ab2ef7f8184bd3028ebd365c6aba1
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10624 bytes
SHA-256: a735d8efb1336ffd069623e0abe01291efc0a53d23d36b36ae7c57e48a3c8bd8
font_02_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.