Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0925a4349ec8c3…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 374dfd9607064e356efa58c94102f2e5 SHA-1: 14d56c9fec3d129ef02a4a9e7fe2c6e193b98526 SHA-256: ab0925a4349ec8c3e691706e1f102fb474b4403c3dee7800511134ecea6e5523
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alemotta.com/resources/original/file/laxirebejafudigalowadupiw.pdf In PDF document text
    • http://getem.pl/files/file/18814683241.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3e9c79e4fd5cdd7e9a57dfa906aa4eab/bagetekiwixozolid.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/naramofonubudare.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/donexekonekariga.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/39152471039.pdfIn PDF document text
    • https://rcot.org/userfiles/file/kejirejusepiratapomugen.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/87677964371.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/759f87815702b982764df334278fb923/1768771966.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/721e28c605e5d414fc4e7a56b0fc4ce2/demipedisetitajoxe.pdfIn PDF document text
    • http://hkalc.com/userfiles/8664664550.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/jefomupepapolamo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e901e459cb49a81dfb5ba96fc4d952cb/78272169859.pdfIn PDF document text
    • http://sinostandards.net/upload/files/67709976167.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/93157965428.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/larulerinidaz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/58721654525.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/32133991447.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdeb5f1b6---54349186618.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nr9gc1860jln0lvfeul8p0vjbq/bofegixavokurodi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jexidovanowujisirof.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rowigorebeledipej.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/99cee06902b61560989253663263c7e9/21184890066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=knees+going+over+toes+in+squatPDF 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_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 17908 bytes
SHA-256: dd8111961728402344aadaec9012b362c681f1d4fed45d07743a36068e0e1c55
font_01_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 10540 bytes
SHA-256: 6bd684a83f8141da81f8200120525bf89cb224c2c5470397afac52a9a7939ae5
font_02_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1