Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d5c3637355ab4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 15:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 810e5ddca1743650f57af26b6390fead SHA-1: 659ef015296d0875f9b34da148d9dbc6dea8a918 SHA-256: 7f0d5c3637355ab4f1398dbf276b3316ade7a95781444fadd33540df22b78583
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. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://triple-a.co.th/ckfinder/userfiles/files/42452508067.pdf In PDF document text
    • http://sinorarechem.com/upload/files/64674787962.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/lutegipolumobazegir.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/93222071633.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3a31a1d---fekiliranowajisotobakekib.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/27265888693.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847c1e999---talozebiwabekikunogekorib.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c673042dcb---28555244239.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/71810768294.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/wuxudub.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/99325961165.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/16555735563.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a73b954c6e584bf6e6c26262daa4dc98/72460721526.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/36759571081.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86840428027.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/pujukebojegijekuvubagifo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xizujiv.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/18035075200.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/fametogatebotamowa.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/61742420654.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136343cf1ec6---kudufitosepugejegefakipe.pdfIn PDF document text
    • http://fourfoods.com/images/files/dowanebiv.pdfIn PDF document text
    • http://voijin.com/userfiles/files/99766898895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=justice+league+action+watch+freePDF 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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 16504 bytes
SHA-256: 52519b1952f825004a01d9f9482816652f9996f31c6f7ee672d2404d419effff
font_02_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10792 bytes
SHA-256: 0a7ea265c180afb34f3bf4847bf42b792ee9b7998cb88b0aedf7cbf38d90be0b

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