Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1b72284dfa57b7…

MALICIOUS

PDF

102.8 KB Created: 2021-07-03 02:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4666d8146bbe73be55716464aa8fe406 SHA-1: 31c7e36e77078a49b4ae32d303eba1f3060d940b SHA-256: 7b1b72284dfa57b78ac4b6a53dcbaeac191f948c8a98f733edda563723284999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=prayer+points+during+fasting+pdf PDF link annotation
    • http://dogable.de/userfiles/file/dajinedutuxebumubokonebe.pdfIn PDF document text
    • http://hzqzg.com/d/files/boboguzoxefiro.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/87391544589.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dfjgj36je8d7h9k022hebs8klf/gelidotezufakuvu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/69638321529.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6f5945a14cf1d697f5f748305a16f51b/26456462445.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c878d9c61c7---zovaxixem.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79727fec7---14567052075.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1131b260---83399532028.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9868c7b4---7308523896.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xajatofanokeka.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d9815e2d3a20686cb58f2859eb91f509/gepagazapodave.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/5324524843.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9e3b325c2cbcdae39fa2a8b51d5e0773/2647584410.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e28jmtlqgbu0f8dn82ho4ovm62/23378289751.pdfIn PDF document text
    • https://arendic.cl/files/ninosasilupobafa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/38585813716.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/79443392372.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/72193347220.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/039c6989a4ef04c54e4e0331c53e08ca/vowuvakoxaminugixu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/85c5006ba744107b3f7af84baea73cdd/14782513153.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/mikobawireberod.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9rpg66b7566dord4d9nocvd79r/welesodaneloren.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795d7f6da11---gatitedupufegewepogudo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbf5d47b5b---70108205463.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_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14843 10840 bytes
SHA-256: 7175295984b26f3f99a8b8f8f88af62c29456bc905f363c5c9095ddc44692501
font_02_sfnt_off00016134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16134 16936 bytes
SHA-256: 24cc99dc45c316ad0485cfa91e6cd09b3fcac0dbc5915babcaff436e3b20f59f