Malicious PDF — malware analysis report

Static analysis result for SHA-256 f343096cb8a1fbea…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 22:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04ab7b93ad4b431e9890ee6d341e9d11 SHA-1: 01388a5ec2ab9a148c7e25c65490eb428e1d97d2 SHA-256: f343096cb8a1fbeac4784bdf87e1b01ca053cd548801a7ff4947281350d2202a
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. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inverpalmas.com/aym_image/files/kedawuwopixe.pdf In PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/89788030550.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/kozogovimamupaluke.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/relifuvuveratepotugu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mujezakupefifepanakana.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/9317657717.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147235e11cab---5752929041.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/36296575624.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/4431146726.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uu0g35rooedc1rhe9qjmui56qs/98717892918.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/19361175131.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210917120713109.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2leo4vj4j57tnk62u95ld2am60/4645769359.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/36318526051.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/27965397188.pdfIn PDF document text
    • https://cristalensi.com/public/File/97914483204.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sinavonu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5f29e48e167d57fd3df81d12b8aa524/87188926696.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/7579332980.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/51922865851.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/seroworowujip.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/mevamaguzojijijodixitera.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/60703706937.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/65516891020.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16145154c41709---2797757670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=games+download+car+racing+for+mobilePDF 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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 10988 bytes
SHA-256: 9a672d9b64598b4f58a9cf459af3c2bdd71a42645bc0762847f4107743a7934c
font_01_sfnt_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 15760 bytes
SHA-256: 0e8fe12efbab8f8a1aeb33e2b200f0180b8a6f0c29cb168abe9d245c2dbe0dad