Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6bfab18835393b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 10:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ed6dce4a23dbe1428c891726768df49 SHA-1: d87552d525a5720231efe908a84ab0b00c97000e SHA-256: da6bfab18835393beacc2ff0dc3b1000a8a7fbf1ecebf045720c388e62409007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and the nature of the detected heuristics indicate a likely attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c765a202ab---47911088585.pdf In PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/12367403382.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/096dfef60c5065f2db80a960406296eb/nerob.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c793e4aa6fc4c30e97f50019697e590d/kitavobumuniwovugoxeweg.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r9fp6q3f96t4c2n91ukv7gait2/loruwezoru.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/rowufupokanuxevoruxezemuk.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/tebor.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r0ej33i2t0mkqa15j5qjqte02l/bojatutavifopuvesan.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08ea0c2b---mojatuwazitasekutixomo.pdfIn PDF document text
    • http://na3.it/misc/file/37514556150.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/balozem.pdfIn PDF document text
    • https://domilot.com/uploader/files/28242368842.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d240580d7---buvefuwamuvevujewubago.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/85292387827.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/numupobubanevebofesew.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fadiwofiwewarajazuse.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c396ef94a54---nemiwikowiretoxijukapijal.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0b69ea36---80354291763.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sanate.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/69879571355.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/34991369799.pdfIn PDF document text
    • http://fittbike.hu/files/file/20025128288.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/1675789454.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf899062d---xobegujisuwuze.pdfIn PDF document text
    • http://bienbao.org/uploads/files/fejufugomuponixezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=program+p4gn+pdfPDF 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_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 19256 bytes
SHA-256: a33d35deaad7c329ad6236e45f9af4251bbf116dad0ce0b9330dd157b22be186
font_02_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10384 bytes
SHA-256: e48772ee212e5ad9502c6225f78c6bd8f73b3edda2225355993f2a3fcee81fe4

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