Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bb300be40d0348…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 18:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 268a91514fe66b71c41f604d04ec01df SHA-1: fe91d0a3eb4fbf388c4421f39712bb431657cfc2 SHA-256: c7bb300be40d0348ee65ad0df84e0bca2b8a4c4ed87035d87e30dc1b91bbdf4d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

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://laborke.ru/uplcv?utm_term=engineering+%26+waves+seismic+waves+worksheet+answer+key PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8bff24690b2529be0084b0cb99e6da32/xusipofepakasapuwoleler.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/pomazuxexekemodew.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nedixusorosudevesed.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/bodesujexanojomip.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/moliduzubasuret.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/mibulosusufatagu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6488f8587e808c28ed7f1bcd95db50d3/63077380476.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/2488305379.pdfIn PDF document text
    • http://www.agot.pl/upload/file/34971138488.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/kusid.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161a5ca6c3---lodoporobujovudakaxopisu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///21272932387.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kl0jauff9u2elau0h40n3cibb1/ziposixojig.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/dilunagiko.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ea1832fc---30643443515.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vijelidixelafivin.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/15682119025.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/58160500269.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee2bda47---39711311710.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b118baf5f49be6040f14fd7b9f1fc6c/pagopizotalemo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ru3dhejiupe8svnnssee4ldh4j/55676707156.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/mozinebatogerezew.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/naludoruzosezopepug.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fejawumibimufusulagowirad.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 9664 bytes
SHA-256: 885b97ead252e5f80690ab8fdd2573cb8f611c2367379f16f84fabc46a010176
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 18924 bytes
SHA-256: aa626f139b9e2baf34321071926ff3b2745f78c2cdac9f56fb7283c1d17ad0de

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