Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0f04242c42c742…

MALICIOUS

PDF

83.8 KB Created: 2021-08-23 17:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8220c485d377ffca15a799214fc95bd SHA-1: 6d7e5d6f5010bd8f90a5729b8f5072a570b7cdcf SHA-256: 0d0f04242c42c7429ae5d957277d4327b720e173de32807dde1dfce8b7a6dd0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and the presence of external links strongly suggest it's used as a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=the+science+of+human+hacking+pdf PDF link annotation
    • http://learnersdigest.org/userfiles/file/90211286152.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a3d7297e2f8ebeec5fe8d632dd960110/56976713141.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c7b77e52---banerofu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb3311bd3---jekufavibukolewasonuna.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27c3db40d---letikijute.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/95861752718.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/zakofosanirumin.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/93595946100.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/465e4f79e52f183ac2a16e57d9464c54/judulifonudimexofajuraw.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gixuxugovilagofukup.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd7f92dfad---xanidojubofiw.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-4/20210704031612379520.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/27735320363.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/sodepitiruravudaso.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dc1c1cf76acd6378763fbf3f1eb4aec2/bapomujofodidinowopog.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/dorajixarurogowexe.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/70221777155.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/xiloribefewuzobikonidizip.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d3762ae3---pufugiwebav.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad681313380---12365204803.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/84695682746.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/839307b2213c0656655e266e276eecf7/suduwiz.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/44443600183.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10980 bytes
SHA-256: 79dd7631101625649fcaffa188a991795661b40c56a99e1e815b628740bc9245
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16444 bytes
SHA-256: e383c278c62d899d2fb2a06db6bab4f7909daf1e91a90801e2f288986528d451

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