Malicious PDF — malware analysis report

Static analysis result for SHA-256 27277fb8fb584059…

MALICIOUS

PDF

94.2 KB Created: 2021-09-16 00:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf40010c32af33df139b9b0410b61bcb SHA-1: c2890e24bab3827cb9286d371f5ac7f0654cfbf9 SHA-256: 27277fb8fb584059cb2b5913dfc9ce748450be8578b1274fefe9123eeea99643
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the 'link farm' heuristic strongly suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://domki-kopalino.pl/pliki/jinosiwixunetumosoveporo.pdf In PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21221254612.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pinodidulowosujukivesa.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/82789267438.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210911123812.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7fcbda624---9985308187.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/vabejunuroluwevu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/14208380114.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/fader.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/15343852701.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fivepapulegegevuli.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///10308517118.pdfIn PDF document text
    • http://ahchala.com/img/file/kukukapozojotowiv.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kenaxewugitoneriwatavev.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/63453149004.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614262afc3812---21737434394.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/93038494026.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/96067953104.pdfIn PDF document text
    • https://thehouseproduction.net/file/pitosexufutezexupuder.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860aa8683---tuzegazakevu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/kinuton.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jolaxijo.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/repixekewivivex.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/refozawojuluteri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+russian+sleep+experiment+book+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_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 18832 bytes
SHA-256: c75e695a659bda4aa07769c9339992fec5b4a4fc7f8c3fcf964ca37562e031a0
font_01_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 11160 bytes
SHA-256: 29778d56faf539117eb7bf248d5d76ceefd5af8ee53c1ebd81e222772393b2cf
font_02_sfnt_off00015323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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