Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed1557311092b6a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 23:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ab56484d3172ab8fa17d03e193c820f SHA-1: 68bdd13ec2293f4184a45321824a5852ef21a96d SHA-256: bed1557311092b6ad87ec91ed23fa969170978e180b35dfccaf15dacd1d90886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, along with the `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic, strongly indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inprovit.com/ckfinder/userfiles/files/rojiwutikidabaxigox.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/98152438341.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657174f81e---gajuzolazonibef.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/36687106232.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615308cfcf9d1---40182679950.pdfIn PDF document text
    • http://telecycling.org/files/file/toloperotegute.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/98473211940.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/dajuvijib.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/kajurojopobolojude.pdfIn PDF document text
    • http://teraval.cz/res/file/mabuvotimevutitolulutono.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86608278113.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/70381880254.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f097d191db---55561545587.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/67109256945.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vipemamogiretu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/4787760658.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/faxipib.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/87727716121.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/kisegudoxapexubutonojok.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jagitoje.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/razixabotimuvebafozupir.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vonenisapesa.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/47518140074.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/melotexumar.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/11348658877.pdfIn PDF document text
    • http://synfarm.com/upload/files/61755109677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+adjust+brightness+on+kindle+app+for+androidPDF 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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 11316 bytes
SHA-256: 79ee1ec12a710a7dd90c99857d96cc9cd339163787b7f6d2e8e641b1e8d511b6
font_02_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 15276 bytes
SHA-256: f896eb43752627f386d3f96f19ade28a286d2f76b2a1a26e92cf9469e27cb982

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