Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbbac94504de603…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e3ca260b9dba9f54264470872eee1f5 SHA-1: c993ccf9a874f6371f40053f6e182ce89d11c7ae SHA-256: fcbbac94504de60316cd29494487f29cc8a647046b475678079bb61f5c454088
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains, a common tactic for phishing or malware distribution. The presence of compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://pixomot.ru/uplcv?utm_term=assembly+line+balancing+which+model+to+use+when+pdf PDF link annotation
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/90050811504.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/pukaxixuxorelageweses.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb139f7105f---ridimogilisezimagur.pdfIn PDF document text
    • http://dgjst.com/upfile/file/semepezilozukere.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/revezazejepujobujagu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/77873953816.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/14621177586.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abed082a9cd---zujimexawate.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f609721e6d---47669975657.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/72067378197.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607074741d3b9---91562446521.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/519d99a39e3ffe6c7c5f5a113dba0dca/23462201595.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/61843742818.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428b4184b4---muwaretevasefakuwagedos.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82287804971.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/7853230206.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607585bdac74f---7683003514.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/33706122992.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sirewexinokemubuxa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705d4c4f828---87038766333.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/45c47c25a82b9625cc2ce3016295874b/44450958786.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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 21040 bytes
SHA-256: ff0393f4b7a283459acbb90e2455638a1c56213cca16abb2b4b6f68e0280a38d
font_01_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 11388 bytes
SHA-256: bbb5fd9d9486c9b22f30623bcc9d2b439b31fb5d80e40ee635f8cf5854bf780c
font_02_sfnt_off0001472a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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