Malicious PDF — malware analysis report

Static analysis result for SHA-256 49053c43acb7ac5b…

MALICIOUS

PDF

76.4 KB Created: 2021-07-08 06:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 550854472ff0faea0fd66a7ead3e2394 SHA-1: 484d734930a2be95e4e9dc01513577fc9b83ecc5 SHA-256: 49053c43acb7ac5b7d9225776a409f309ff0b01f176b5ad3feec6b45e522aedf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute further malicious content. The PDF structure and embedded URLs suggest a phishing or malware distribution attempt, potentially leveraging a PDF exploit or social engineering to trick users into downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://signika.pl/Upload/file/fitole.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fd8841a6---47684814324.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1086b98ed---44432488893.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/47935150906.pdfIn PDF document text
    • https://arerp.kr/data/file///tamuniligidisovaz.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/38568367085.pdfIn PDF document text
    • https://vestol.bg/files/file/7200185434.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608377f0a3bc2---fuvevenilemaxa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091ad85387b0---14414887878.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ce64c5cef7e8c48f5c76eef27c4bbca/25220407025.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/pekasezez.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/64e34c9bbe84f32b9d23a9b5ab2c1c30/jidadorufajuza.pdfIn PDF document text
    • http://edgecs.net/documents/pererivinevezagix.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7o539bab2v8gkji3e6132nijp1/61452744270.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620864858.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vibunitupexosi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/10972383760.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/42042623664.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/54158078985.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jujobawebuwowifet.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/48979009861.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/beduvixesilive.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lunifamus.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d24bb785b6556ad93b8bca1c2d746a8/70089531315.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/38779285074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+switching+technique+in+networkPDF 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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 10880 bytes
SHA-256: 92282ce109718d61c7f485d61ed3ce82affb7c7d3fb0ec3dc70206d65fee8077
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 15848 bytes
SHA-256: 38c969f82ea7697ee2af2eee8e3769309347e600ee58941f1080b12e4171e69c
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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