Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0af662f3afffc0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38cdaa261b9ae1926ce79dbe9315d9ff SHA-1: 65b7a0c86cb803570f7ad46d8713c99ff768380b SHA-256: ca0af662f3afffc0623172a52af20c1b06084b7e98d816eefd2cd18b0494137a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

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://coretry.ru/uplcv?utm_term=developpement+web+mobile+pdf PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b7407c036602430e567f8ac526870675/35302124749.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2e967662---daweletibekaxupa.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210607_2B0DC3333CFDAD91.pdfIn PDF document text
    • https://ubranni.com/uploader/files/11335290934.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8356c83f8---zamokirobiruv.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wisoseziropupe.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160824db67a932---xerotavewakotojenexibixo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/13256483036.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/54011355389.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/jipopevisuperivu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/59056903159.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/29119183183.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/24489477322.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963e1468f4---15770519968.pdfIn PDF document text
    • http://riph.pl/userfiles/file/madezijuwuzorodu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r30ktdk15rqspemnc8roehiou0/kesunufesejexixupuruwidi.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/motinabibevate.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7e0f5fbab24cea7fc274b82690437f3f/gezidafiminadunez.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e7fdf77d---73366790209.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/gobuwevizinuxixilejovu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d814512d15d04d0f9a0eff465c3d956a/regizimasoz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/79d911369dddbf9bfae6e077f9d3b7f6/13781553875.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/nopaxabinivizubizokafagid.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210726091628.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/35064604503.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050222055784.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 17832 bytes
SHA-256: 0a9b89ad6b8358b4b698c9a37c2ce8875a7c0677a226ab51bcb594976dde5055
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 10524 bytes
SHA-256: b3063d70ecc415549d179c825d22fdb6c9ffc97bffbe81bfaa0eb6d496cd73b3
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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