Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e540706c7d52b7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 10:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41987cc890bcfd2a0acf156b7e617f94 SHA-1: 803a11b9c27cf711f600215be46cd8934698c9eb SHA-256: c0e540706c7d52b793983d9943818a87fa73d044bae811c2ca1e1400914f5c33
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=isolasi+senyawa+triterpenoid+pdf PDF link annotation
    • http://ahkkpcm.org/userfiles/modizazad.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a0d782374---pivajabiwoba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/bimak.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/924c1ccd0590996b4cffe00e751fa8cb/dupavelu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5794b780ac6c27e34c72428fb61081cf/xonebegikodabovepur.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/32061571143.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xosefifaxurarug.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa826d0adf9---jugesewawetakinegas.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/27322146831.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84412059229.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/47400074164.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8065d808f40939db438d1fc6986a2fad/22810498147.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/47171363741.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160846705c9147---24809953773.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c44b78375610b97f3ab70aec59a2659b/zigukan.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl8fp3oavkssrpl4cefc1hu8ms/mejagiduniseti.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16078660450866---53675000224.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sunogolimemojibagamapokuz.pdfIn PDF document text
    • http://caraudioshop.ro/mm/file/32013784205.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbba0e8d0---valilasupesomegoba.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0v37146tafoj8ve3b8gifr4q6j/kamaxasivusasazigopix.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/18a0f5f90196efda656bbfacbdc499de/29400975745.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/91960923762.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/bebosamowali.pdfIn PDF document text
    • 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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10640 bytes
SHA-256: 9568ead36dc892193b8fc966f583e7545c40059c83103b2efbdb84cfe0040d70
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17816 bytes
SHA-256: 7a2de53b169a5508b1495e0a2f6dcff46972aec622cf88fc42ae0bb25cdaf880

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