Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f20615f901aec3…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 08:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c2fc07e8b0203c79c28639576f6b360f SHA-1: 79a3c6937444b870924f37c053539a502ddcd7f2 SHA-256: 09f20615f901aec3d991b0e31f0f328038a5100f5aa8ca2ee2d17606ce1b0a79
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160886692350aa---riberobovuwejomiwokuki.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/mazewomuse.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/mutotojojidelabedumoliv.pdfIn PDF document text
    • http://alltechsro.cz/files/jatoperenaresumodul.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/wesadimoxozepoxekop.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vivebupewavuwunolejokib.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc115k3g7mp60qfjrfsl8pc7ka/posikiziw.pdfIn PDF document text
    • http://npas.ru/pic/file/bazamuzujuf.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/vaxeponidorit.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/ninubamab.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/28710573967.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c18a48ab6---37806305906.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/egbtja4rt0ktumjl7uhjsuf3ep/gamusunomidimusugisir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610586367bacb---tanojenefejedemomowaro.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/rokibujemasoxuv.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c497a09b6f---tanulunapul.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3ffd6a26---44122892083.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gn12qq8lobm37dd5fsg30oln35/49769556836.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/13204445245.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94444105277.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hsln3h4ln2oevhihssl804s48h/zenosixutugulike.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/baxomem.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5cf767f3---4323029759.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f913abd3a6---gufuxobatu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8d80511a58c7cf25608f5504c83928c3/33586918925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+grand+inquisitor+dostoevsky+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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 17404 bytes
SHA-256: 2d33a53aed6bb254e71dc07b00d2ad1df6302a3e7fe6e3663046ccd952397ac0
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 11212 bytes
SHA-256: 69c7e5bf8a83180c9fac93686e9f7c99f350f7b710f3270b815776dcf9cad8dc
font_02_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1