Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaed358f40fcdf92…

MALICIOUS

PDF

86.0 KB Created: 2021-09-22 11:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f35bfb55bd8cd6b637124d0a8bc5a9a SHA-1: e4511a42c9f1a09a63582cfba33bf14bb3c6fb4e SHA-256: eaed358f40fcdf92ab4cab23b367bf98587191dd34a206769d3e2138384e2906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://detskaoptika.cz/ckfinder/userfiles/files/14672476475.pdf In PDF document text
    • https://weldingportal.it/userfiles/file/kisitojesijigekozow.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/davixadiruj.pdfIn PDF document text
    • https://scalper.ir/data/files/file/95327721313.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/47522025380.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/7694753885.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5f2b91bb---fetawasiwinaroxulupapole.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918025402.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/salodevegagi.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijosukokamafejepemela.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef79cbf3---47313106840.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/29431972770.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sotukeridegosatak.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/89794335277.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/7436543027.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/mimefudimeketuwox.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5943bfe0f4b83b267dbcfbd4766c6423/21655101383.pdfIn PDF document text
    • http://pnalog.ru/images/file/demezopikodamoferizi.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vodom.pdfIn PDF document text
    • http://darec.sk/files/files/xesiluregedasol.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/92157102272.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/nasaxa.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vubukefe.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/mijujimuzunewarofiduf.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tlj35dlpo1m4t3klpj4ho4npis/xetisepug.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/worazijudopisenevonakege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=50k+followers+instagram+apkPDF 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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 11036 bytes
SHA-256: 14c8134368df8146a41b06970366216e7d1f31c32d40a5cdf5e0fbe03c5cb135
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17924 bytes
SHA-256: f2be27580eb63578b42b26e65eb60d96b13c92b4fd7867a0e89cdaee77b99256
font_02_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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