Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7acbaef3ac49ab…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 12:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18b1d74546bc9bb3c7fb0e7766da4108 SHA-1: cb1c8b7312346f1fe1cf415ea1bc3dcd0c7f4c6a SHA-256: 0d7acbaef3ac49ab68070638dba9e110d594a003034cc31ddf707ba13dc5e2ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be directing users to external sites, potentially for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://comfort8889.com/upload/files/bafapogevuvagamipeliv.pdf In PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/55438889169.pdfIn PDF document text
    • http://gewald.ru/content/Files/32469766013.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/62475519867.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/84155168783.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091204574473499.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/44360600800.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kamitedagilifumuvome.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c22a1b1a---50688115070.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/kasarupebamul.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/mamutegosizupo.pdfIn PDF document text
    • https://gangnampools.com/contents/files/62438769824.pdfIn PDF document text
    • https://bfull.ru/uploads/files/bemejapivarivoneri.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/dapulatuxo.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/negapamusosikef.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/5334174515.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/menozusujapinegapifup.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141db1803bb4---jevitera.pdfIn PDF document text
    • http://maksimetall.ru/files/sazedugitifo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/45873966490.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/mesaxogevejo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7mevae3h8odb9t3gr17n322uvi/dunomerofizokodeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+windows+10+apk+free+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/nerujifabisajulaxeta.pdfIn PDF document text
    • 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10728 bytes
SHA-256: afcff65f362016dc5af8ad7f48faa2d9ae9d471c701ac086a32b651138ebb699
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 18196 bytes
SHA-256: 52a4eb8d088ce9c6923a49349ee51c3bee7236546c1c41d6df780ecf31ece622

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