Malicious PDF — malware analysis report

Static analysis result for SHA-256 db539fdf498a13ed…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 17:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6425610dfb47adfb4ffe0ae4170a9457 SHA-1: 28ac0810ff0fd6599a2d65e608635bf88f8e307b SHA-256: db539fdf498a13edc9fab6f35c4da1380a477e94d830115762019f92f7bfe860
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains numerous links to external PDFs hosted on various domains, many of which are flagged as unknown or potentially compromised. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dienlanhlongan.com/upload/files/menipimuxarugug.pdf In PDF document text
    • https://futurefacesnyc.com/uploads/file/fulubuxe.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/nawiwusat.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130af9e824a9---xolifaxubifime.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/1873071744.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/51678025073.pdfIn PDF document text
    • http://polipack.ru/content/file/rafopamule.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/39275193875.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/16342092560.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd5a6aff5---kuzisidafetirob.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/redatubi.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/40081504237.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32407985359.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rotipirenigisogek.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/jasamut.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/36663855690.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/79343437164.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/542e54060d550b39c985a2a03cc389af/fesuwosuv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb13962222f04bbe5086180d5cc3ec83/22564994961.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/87456226448.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc77c4030---lutezezun.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8578072834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+way+to+convert+pdf+for+kindle+paperwhitePDF 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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 18604 bytes
SHA-256: b05ca3eececb8eeb9dd8a1a7c31113c368f149a02a89f6768e7f85f27eb3e22a
font_01_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 11128 bytes
SHA-256: 9d6a3c557aa471a0d1d7e57e0a281ca418e9b93067bdc41e735f1d79703b0b28
font_02_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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