Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9e45c9f6a091fd…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 18:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 70c1e26301acad11d85851f681874883 SHA-1: 5ae92bb0969775653885f288362616a7dd6a3774 SHA-256: aa9e45c9f6a091fde66e7cb66f60b12dcec5b0307cf14e0cd88b7c44d387bc16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various websites. These URLs are likely part of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161290022556f3---luludatupibolemajifo.pdf In PDF document text
    • http://petgears.com/app/webroot/files/file/11318199755.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842bc5ff9f---64441776478.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/zubopanusarenikukirumodot.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/012ff2bd0570b8c63bc63c021e8b91e4/26012080644.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/96239869890.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cf8796473---16548508667.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdefc04682---vipeban.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/fazado.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/bokuzibawagisugodizet.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/20671740927.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cc3accbe49cf24c68e3a735cad05b76/vaketosesilev.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607052a7ebd79---nevafobebuzusodorebawume.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/39847124473.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609490382ef71---movusakobozojimezozozo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb11b58e53---91130905856.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/36902191859.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0834659fd4535d6559121851d826010/fatakan.pdfIn PDF document text
    • http://anpo.vn/upload/files/33055628032.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tuzixe.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/72577174051.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3de55d687fb132229e5a60108063cd90/27977950714.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/feguw.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13935247971.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160944a7f97a21---pojodivibuzixuxawufure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=l%27ing%C3%A9nierie+p%C3%A9dagogique+gilbert+paquette+pdfPDF 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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 20660 bytes
SHA-256: 4ede73f2a0ad9111727f6f521ae1dbb34aae1340474f63e8a156958d94962a72
font_01_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 11036 bytes
SHA-256: 92c2e5176171543e6797c7a25e012a771fd3f94a96c3c4d0336ab5a755a4c9ce
font_02_sfnt_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1