Malicious PDF — malware analysis report

Static analysis result for SHA-256 e908cf6a3aeb567d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fdd9ef38924de31eb8b749291c24a44 SHA-1: 66b63271df475d2582be1e4f22d95d05f6e42e20 SHA-256: e908cf6a3aeb567d5e1d2677801ec2129b406e06ebad5489d7bd805301ae6a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. These links likely serve to redirect the user to malicious content, consistent with phishing or malware distribution tactics.

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 https://chcial.ru/uplcv?utm_term=medicamentos+estabilizadores+del+animo+pdf PDF link annotation
    • http://tragiaocolamsapa.com/userfiles/image/file/2142353423.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f37479c737c2743ab90ba735b0ddfbdd/nememapebibixi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abb2cbb4b---752246799.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/27126631967.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210815194355.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1cedc7b9---19726597355.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b24ff4191de33832f2f16dae7a733dd6/34036128173.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096159ac7533---molonokodu.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/wejekaxej.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e448c9ca3a7693e75371e4392c07581/vobiwajuporebowikili.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796fb1738ec---xepifutovufu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de80e04a8---vuvufi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/tefusexelumewuwinemuxosew.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4c53d35---92800296947.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/46983941606.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbde262761---1389675058.pdfIn PDF document text
    • https://atl-50.com/files/file/kutevasuxasenema.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/watiw.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/pugelu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/tutuvedalejejijov.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/vopasukejo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/lo7qd3q49rcotct563juupl4s6/53170690774.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ts9ucm80sra9df1usk8mnl4od0/xekusekak.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/96tmmo4eagfeuk483rg417smrn/59629508579.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67783909108.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/23866604158.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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10972 bytes
SHA-256: 275c27e5da1071677a37d5b04991a3bc1a6ca271c928023f8573db12b2f40a1c
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 19956 bytes
SHA-256: 96b6ca45d9c57f6c267fadd9405af246cf3c48d62dcca6e240bc89c6409d6c4c
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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