Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4c61a6a0ec0f8f…

MALICIOUS

PDF

79.0 KB Created: 2021-08-27 06:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a92be94901f6cc04ea439bf708cdf7f SHA-1: 5ca208be2ef4af48d2f18a327dda4fd02d5a48fa SHA-256: cc4c61a6a0ec0f8f000616d00ed2bd938cc1b95649ee65a5d1dbc13f5a6ee17a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised CMS upload storage for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51cb1fab8---84215593831.pdf In PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7du35mks5vu90eb20a0a0qj9lp/87372607687.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc6de8bb7---wapifuxibijowet.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/61788242057.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/54a5933708d81c76b7cea2142488e12a/28407573874.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0e2065580074510f45ded1953a45e751/geriwifezakipagovawaj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0fb8257---wifemagolirofaroj.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/5382268386.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071613590681.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wawirogoxar.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16079abb3b2507---movusejunikoj.pdfIn PDF document text
    • http://abwessex.com/uploads/files/siwamudizireg.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/vodaragitumadugukobob.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/27691645522.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1016b2b44---tutaterefigoxovuverawusad.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/ledixupinexibepekafolutet.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/milivetiribotere.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ginapovulof.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/53327057771.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f127e055fd---vufaz.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/21155005654.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nobomeleketajerusizujujo.pdfIn PDF document text
    • http://wernitznigg.at/files/67094182263.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/75452369718.pdfIn PDF document text
    • https://onlinendttraining.net/files/gefawefuwotewolad.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/77344076603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=to+do+with+sound+crossword+cluePDF 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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 10456 bytes
SHA-256: d1f604b08000922f17058f9c63000cdee0482d6bf75285cc7470462959b2db55
font_01_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16688 bytes
SHA-256: 263498e38c491a72e40b2a7b37f48d0ac0359f879a1df6d17c8f46d4dcd35cdd

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