Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57bdb659a26b8e1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 23:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d66d306e8943ebf504055f95c9904cb6 SHA-1: 7ef7b63476c285c5c86046e905b101aa5bc67a15 SHA-256: b57bdb659a26b8e108975089bad09d21f330099c23fea695c0a81a2246023090
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing or tech-support scam. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or redirect users. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sanalights.com/admin/admin/uploadfiles/file/zuzoxuvar.pdf In PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/gapekef.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/37003826762.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/29344128269.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141a96f118c9---92621169343.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/dadatis.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/komiduvazofilalota.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/jekifazurakukupal.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/zamapivunaraj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e302e2a14c---37683464456.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/danusagu.pdfIn PDF document text
    • http://hflchw.com/upload/file/47897258329.pdfIn PDF document text
    • https://menu2uplus.com/images/file/74567550263.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/zejimowuxotajavotuwix.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/92110499345.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/25182307006.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limavefuviselodureji.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210915_215644.pdfIn PDF document text
    • http://tercovci.cz/files/file/piseguzisefepesemekufi.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/54088390575.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/7574864018.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/pebunasepelatuku.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/62666036292.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675d42073e---32496161430.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb5aeab77d---54695478433.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/risuxojijegodofa.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109151427003518.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/9714194593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=converging+media+4th+edition+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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 16080 bytes
SHA-256: 1444196368f4d6fcfc89229214e3d23ef6e55e055f012814891c04e8e77117bc
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10908 bytes
SHA-256: f6615eb22a8fbf9e91dad618af100ef86d0388c029e540c4374f9914d6ac26f4
font_02_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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