Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c02117db9d282…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 06:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7de7cb841080acaf57dba3098a005af6 SHA-1: 21bf53c259a11d56d2aef53b4b80f6359b6d6ad1 SHA-256: fa8c02117db9d282f32b47d213096d0aa2be6234e0c1d9470a1dd1f2184b95d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://easytravel63.ru/ckfinder/userfiles/files/nosobopibuk.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2dfa1ea5---86338967356.pdfIn PDF document text
    • http://duef.ru/public/file/venunopodarulirupox.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904095523.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95539748926.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6125782484379c5760b37694564d2bf3/26897538397.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161452d82d5241---74630879671.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/zozofip.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/509292904.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/lajorugotavojawad.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/fuxutemitafasajifibu.pdfIn PDF document text
    • https://viettrungson.com/media/Files/99312540961.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/51279788687.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rewuvipivozep.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/wakakaxilenodulojajukediz.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229a5ad5f4---tovazudimukoferefalawisi.pdfIn PDF document text
    • https://unitjaya.com/contents/files/92971589514.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161389d6e0586e---40639023307.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/25792205001.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/83233526796.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/20908762208.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/928634735.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/62754764504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+shows+unread+text+messagePDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 10920 bytes
SHA-256: 43b4ec1d09ce3d3efb2eb0ef2596a6f587e51f9861edebee931bf324f8af1b1d
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 17616 bytes
SHA-256: ea1ddecbad9fb5d16298460a2abbdbe9c13d4a4462cc4e1f4c37b433e50e7c8a