Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8115847b6e4ecc2…

MALICIOUS

PDF

76.2 KB Created: 2021-08-12 18:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 853cab07f24235086844f3d2784145fe SHA-1: ee5893838fdae066371034aabc0d5a15cc60458a SHA-256: c8115847b6e4ecc21444048b67d46e4b5cc477d7c59532bc98e8943204034c7b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=blavatsky+isis+unveiled+pdf PDF link annotation
    • https://nepalaviationmuseum.com/userfiles/files/31674993173.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ab440b65ab344b1cd553aaf81ea0fd8b/rarene.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/60140211471.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e3ee7299.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/lumiposabirofilawanagusal.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/90391857589.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8600df26ed---85537522188.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6aa8b2d4---getinaw.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kezivigedukekisu.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vonagaf.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/29693652852.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c5835feb14b5bc36afe13587ceb9723c/37662082956.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607616c5b0a40---24071123868.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/49147175975.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/19032139831.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/84772370064.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f315eb296---bovaxezuwenexabubifodunu.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/gafofokejaw.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/xizogajefefuteni.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_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 17016 bytes
SHA-256: 1b06307a44f9734b55751a0cb30764fed270aa187225a8e85e96ab4f977b1309
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 10696 bytes
SHA-256: b08ad2ece6ccef00e11babaa8208114147956460d9ac04bbaf3b86e942f34380