Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aad111381617913…

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 07:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e355670770a82636435aae54bd201ec SHA-1: 673204652b5bfd3a573056226f4c821dedb992d3 SHA-256: 5aad111381617913cb5a5495a3dcd6cad88ffd733da0386fd7d0018de6765286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fa18bbadafbe9743bd6af99250014ce5/xerokinepezugisoko.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb102c6c9---83833749479.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/90556566083.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/35189008304.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81d5b879a---darizugivowubu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/lukiwujesubusexugo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1e3cb596b3c247d60d04700bf93e2277/81072035118.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/pozolixed.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/2274082286.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e35f1275be2502ea98f750fc23b562e/lesepubugikamulizijosejaj.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/38073788137.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/debot.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074911a902f7---jimutexagozafoluwagele.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9285835414ddd7c8cb1fedb67e29b9fd/falulo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fappgl3ds0n0u4d8dbl6sojost/nokurupajitokujokaxefuveb.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/bb8e6de543af30b7b205b506151279e2/37036998648.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4lfffvt9h8utveivhothi53krh/rubonex.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077714c91b28---42184626891.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c932453da---todunamarixolijobas.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/noredimefosepotajepinuju.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/92963881755.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ae501ad5---mudomolevogujuxiniji.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/83325063307.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h7figtfslakogtl647c8bq30ib/11664044465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=suffix+stomy+meansPDF 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_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 17832 bytes
SHA-256: 4f3ff4bc35fa05207b7e46292b855daa634fd41e839ddc533dd0fda16f131de3
font_01_sfnt_off000133ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 10620 bytes
SHA-256: b9baaaf17f0c652c8786d7d4fb1ed75433666205a3018658a2f035bf85a9d8e0
font_02_sfnt_off00014c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1