Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b230228225c73f6…

MALICIOUS

PDF

86.1 KB Created: 2021-08-19 16:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32f193260558013f79c82a36f4cbdd59 SHA-1: dc1b86295025cadf6671211e0d7d6c900339acab SHA-256: 0b230228225c73f65c54754b9d6ac834b4cdbd4d6188125f89d7da89dc03de31
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9ebf28ce25a5ebfff62e5a2cd3691e71/95658215498.pdf In PDF document text
    • https://stauber.lt/images/files/59756017137.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/16421076050.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/guravezodibana.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dozigodusigejenit.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53dd02c9ec---9884550231.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/balekamobi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b3c1876a---ladovofebagijakipifufufil.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/80055060504.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/90740022960.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094732e6f6ab---jifenelobubobakumoda.pdfIn PDF document text
    • http://araonline.hu/uploads/file/56176529380.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/80f02df97db69736310296e397b0d72e/maguvito.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/54047616070.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/79429068659.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1bd2da23f407bd2a38388eefa06f9d70/veretep.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bfbe7fcbc---buxozebow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b711ca0c940---18944930637.pdfIn PDF document text
    • http://954move.com/clients/4890/File/4540844960.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/75806153006.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d1d5323c8---196302718.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/botaputisipolokoromok.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/jexizugegufegifesoj.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5824c613---wurafulonekozafanurira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+wash+12+lb+weighted+blanketPDF 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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 16692 bytes
SHA-256: a1458426a5c15a38736cb2acaed79ab29cff4efe462963dc707f060af590463b
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10908 bytes
SHA-256: f2a9566c316e037269badf4a72ae88bf76a760d6fdc2672da95281893f2e2334
font_02_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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