Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a73435ae5e5e53…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 08:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da5be8b25ff9831ddcff96b4ccdc382e SHA-1: 37f41ec64cbe89325b98f3e4b281ec64e2f8d353 SHA-256: 92a73435ae5e5e53d47955a2d306f93ae1a7dc077f349aa0dfaacb7518f56ecc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of multiple PDF link farm indicators suggests a phishing or redirection attempt to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://investincarpathians.eu/app/webroot/media/files/zuzigovimodidelunazubaviz.pdf In PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/dokesubad.pdfIn PDF document text
    • https://baglab.pl/galeria/file/81580386787.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/55827170862.pdfIn PDF document text
    • http://armanetti.com/images/11481474054.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/ruwofulenidemebobekeline.pdfIn PDF document text
    • http://aurora-c.jp/files/files/41118818604.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97bde2067---70036601482.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xobumukusivokajoni.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/momasipoposigadupo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fatogoruxererava.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/51983865249.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kefaxodajobiwefeguzemo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e38b020a6ad5ba634e9b3cc9428b1d26/28596172289.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ccc85266---5224935342.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/sotoso.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912014944.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/39757886186.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/luvuw.pdfIn PDF document text
    • https://razredna-nastava.net/files/96763004927.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wasaf.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5eed53428---nowujalometajorikisuriji.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/bawaxibugogapiwuminedobox.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/89365610878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hack+pubg+mobile+lite+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/posiwebugevesupi.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_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 11012 bytes
SHA-256: f2501c924c259130a8339dd833031afc9104c79763c4ec88294803321833a3bb
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 19892 bytes
SHA-256: c12cca1d44534242539cbc3466efe169d38fdcf1038b127d7bf9b867df6456a4