Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909cb861fe86ae8…

MALICIOUS

PDF

85.5 KB Created: 2021-08-05 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0a5f198d0e3bd72343eb2da7d79c765 SHA-1: 7bdecb8b44ac90472aa5d046889a0b5ee92ff6e6 SHA-256: c909cb861fe86ae80ea3f70b3c0a49a16a51b2e6995fd9d0c5aad4798ff4d4b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=horario+cercanias+madrid+pdf PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c334f56a---zumajodogezabagot.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/18076196044.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1cbe4ac14---10441803503.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/85260684515.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fojazefetuvobori.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/13863038988.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/35b7c3b926d8f414fb09f7652d15f5a7/sazofemulewixubinituraji.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/860361c01cb890db06340caac54b9f9c/kalubusofawava.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442e390080---baxebibubabinivugilimarux.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a575cb91e4---81424833016.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/juxunolanagorebusog.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f9f982bd---37595219464.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2f3bc2d03e94cbb96d2acab91377cc91/xowevugibomikomakoxeboket.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vazobelonapevokiguj.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c68876c8f04---wojenurepu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f75fb5dee---92660609250.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2600e34---92339781589.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vogotawulamibojaj.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/86830a8e27878a52cc8a181d82197027/58689306864.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/vaviwuvipozagifif.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/lizusafoxop.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf934710c08---15874527814.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/40120064215.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/34225188703.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7974d5c8b8---zaxaziwap.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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 20312 bytes
SHA-256: 4f94a0300bbd1b457c0e838a4360706f8163b82bb5aa14e8c3eb01481e684150
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 10628 bytes
SHA-256: 17707f3199e65747fbea65169448343a7bd705fc89a150f0383c20e182822ea5

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