Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0338c22bcd737b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 19:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afaafb621c348f74a80db5b08ebd4041 SHA-1: 68add3e82896afd2cf7cfacc0a7d8fc09ccb9f1d SHA-256: 3a0338c22bcd737b35c842965ffeead61474bb2d51ac79db1ed221188e8b856c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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 compromised websites and potentially malicious content. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4e25a8e5348821f4b23ba89e98e7df08/pozijopolisizamowofab.pdf In PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/19970427570.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5cde194674d21244da1d1ebbe4c552cd/14455685793.pdfIn PDF document text
    • http://rotang.net/userfiles/file/mivawiz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a422c018b85---pexunevoledizobamixew.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/89807964206.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/93856596163.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17880f294---4637293366.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/83970521471.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7deb31c7---43088962004.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c77cba48d---sulevajovavob.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa94b1463f---kizasenagokukuramatoki.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/mawiminadusafujowamaregow.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/jemilurufefivuloguvosoj.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zanilokinonomiwutopojize.pdfIn PDF document text
    • http://kaptenhoki.info/contents//files/bagovekomoxapaledufir.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/fegodonaro.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/64112093873.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/03dae1653e2b562202d0f9212e8fd4c7/44044051190.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/95949521736.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/16605063312.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9c7c4a7c---39815404791.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/rarusotusuvalinigon.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/da4ef1747b914fc2af42bb6553b7c1ef/83564820547.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f0d999942bf5c85473b30bb56c96c38b/83888585594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=past+perfect+simple+formulaPDF 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 17656 bytes
SHA-256: 856f3420dfd5f5a5a1738c93e5a10eebc59ab4bce698c0dcddb995d29750f803
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 10640 bytes
SHA-256: 1fe13904abb81aa2e27484f2c908c433930c8a6b5d44011e0453c327b49e42fd