Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa2c1e1c9d8559f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7a9c3eb94d2f2f1767949c6203aa3a6 SHA-1: 5eb5a3a9742042e49e017fea74d37b873042d78b SHA-256: 6fa2c1e1c9d8559f0beb6efadb423ea47cb48f59ef060bcb62886088d96e483c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://longchimvac.net/app/webroot/uploads/files/danin.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/7786092856.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/89074426843.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/sujebivowagukefe.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/xapewib.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/28ds2fllhvsd13ji3ve1qnbq9t/92454779469.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xedozosakemigabovumidilet.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160899c093e357---jegowuxutejulivap.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/64466470820.pdfIn PDF document text
    • http://ropesadventure.com/d/files/razanuperi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/41ca072eb196950c5f719cde103d0aa4/busobefoxopagukoluwa.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/96137034970.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/mowibekal.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b75db274bd5---sufosorovusutezarakesuji.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/56947357330.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/vimunupawowenoloter.pdfIn PDF document text
    • http://adice-area.com/pictures/files/raxofixupibezamib.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xaxosawogonivokotaxanezub.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be777bf1d52---ruzonogegonuponudop.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/61978312836.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/wozibapuvamekirotaleka.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bo098gofvkb45ffviln3i956os/94252623835.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/13626253310.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/40315193509.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/6580746664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reduce+size+of+pdf+in+adobe+reader+xiPDF 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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 11048 bytes
SHA-256: c9dfd14cb3fb918578e59beb7772debce0f43816aba4e248376b57d1c0c7a2d8
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16732 bytes
SHA-256: 48ee884d8c1ec6832add8be07553e963ded04db73195bc1a77337b9894df0dc0
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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