Malicious PDF — malware analysis report

Static analysis result for SHA-256 acab1848c9e93c5e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecfb020430a9509934205f965682c3f4 SHA-1: b262c188279c0c6ee02493ace1d5c6c57d3fc6eb SHA-256: acab1848c9e93c5e1fafec0144b33956cc3d824e5d88ca7d1f8c96acb697ead8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://foodzipo.com/uploads/userfiles/files/lipuropedofidame.pdf In PDF document text
    • http://ingore.cn/upload/files/37962095825.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/44e79c8cca9d9f72793f3a3a306a9d63/5365048728.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/12663652207.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9c1399cb---nakilekigowenomekigopotu.pdfIn PDF document text
    • http://tcihk.com/userfiles/1822141055.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1447a1fdb828355f9f1b736e75940c1e/52450620183.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/mamiborewowaxexuwilaf.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/xefomoka.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/458a03d2a88783f56eb802edf3b5dd80/gejedudomiwarulunosoj.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/90873106607.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/33286843153.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd96c1eb3---66930824007.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/fewigekesod.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/74165257557.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vezokewiwatof.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/2683419838.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/takivasixebosof.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/joxipu.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/18197055000.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sb06mo4f6o509vpanpaftpfo02/dafaxenelixaxolesinesog.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411c3357560---gexaniwatekizisabid.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/19664297425.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/63010583131.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/xowubibaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=instagram+story+view+private+accountPDF 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_off0000b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 15648 bytes
SHA-256: 53628d7c485fd9c2e0e92687aedebe2092d6fb17b9da120d7883baabb7ce23ed
font_01_sfnt_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10988 bytes
SHA-256: 0de3197aae5330fde17d45ec4444744bb8edac5ea04668693de3da909e238477