Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ad77ca3512bae3…

MALICIOUS

PDF

135.5 KB Created: 2021-09-06 17:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fbc35da40f217df7f2082be7ee0c6e0 SHA-1: ce3ddfcfe0d981777d411e73e6824667985fc699 SHA-256: 27ad77ca3512bae3c30cc96e5ed557e669a74b77b263ac4ddf4e616d1c502e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious or phishing content. No scripts were extracted, but the presence of numerous external links on compromised infrastructure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9e5028ba---xijuv.pdf In PDF document text
    • http://cwesp.biz/upload/file/suzetowiposa.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/210b7a67fd9bddfe83a5134deb926b9a/xepaluvatolifijuso.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/13460540750.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/10197828466.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d41a2c0a402f2d1da560568e9ee00fb2/98871162917.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/78234989348.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/79943571053.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/92856500281.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/noxobofakite.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/29613762658.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/viliforisazuzowatesifajo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fdea09ca37f---junuxugubukepib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562aa883f6---98063233398.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/4588800390.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/57597527302.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/39776602725.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3e7c6f4cee2c00d91b92008e9048bbf6/riwututaxifalo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/japewunupetusivud.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/95928342601.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2cd663e4cd9f7a736496fe22e56a4615/pumegiwajedemivi.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/56112097667.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/ketasefarokepa.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/82786856684.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63779687e---40236556385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ricoh+printer+sp+c252sf+manualPDF 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_off0001adc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5D9 18584 bytes
SHA-256: e0a26c5c6f801bdb757d4c19ab2bab7fe25892dbce43cfbea7f0515c581a513d
font_02_sfnt_off0001f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F60A 11144 bytes
SHA-256: 05bb1728f1cee9c7d8b530d02593cae5d2dc3b447a530db1065f6804f6a0b429

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