Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a3ff3a4f0f664c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ee644251cc6b7008443ae673dcfc264 SHA-1: b075060f7948873f78c5727112a6d052748ea627 SHA-256: 77a3ff3a4f0f664c7cd462bffcf81de32cbc6d8470456d49bd860ddf42df3587
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/338a978559476734e1df9cf624484c24/28932077619.pdf In PDF document text
    • http://andlupa.com/userfiles/file/44613560706.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97799629767.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/72808711111.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/temizatogave.pdfIn PDF document text
    • http://proxima-design.cz/files/file/57271159149.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/iivl192totc2ag3o1uqq5uuqr5/21386545080.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ae12668071b80518c5c799fb5adf6d9d/zezope.pdfIn PDF document text
    • http://cocoal.com/uploads/file/5061283882.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/jogukofegomi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7kr8sja26uj1511b8nema96ibf/31323508877.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kunuvegalodajexiwamolan.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe0e309a63---waxiwidipudogepobe.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xobubesitumofideleve.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/bogopubazezawixipi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc89636b836---99623266812.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1f96b3da---46605950636.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/gozomuleruronusafop.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/moboterekufimogejupoban.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607485049b4df---80775715691.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-04/images/files/93712688999.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/92414242612.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t7ilgpu58mevuepi71uqghie91/lutezapaxoxeri.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/39881344390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lewis+dot+structures+worksheet+%231+answer+keyPDF 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_off0000c380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC380 17224 bytes
SHA-256: b242a6b626f7b74688c191cedfecf419d1711a418bd942915b399c0e59d930a9
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10388 bytes
SHA-256: cfbc5de18b1dd668c32e38171882e0b3823a309f2042612109e4b4c2924c6f10
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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