Malicious PDF — malware analysis report

Static analysis result for SHA-256 da749a4a294943e4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 11:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5494438bca901a1b43bed8e4c9109fb0 SHA-1: 2e431080d8c31f02a1f1043d6e460588f0412080 SHA-256: da749a4a294943e4c7d12663d18030e1dc9a138f9ff593af9e89107e0711f607
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://svarovanijelinek.cz/ckfinder/userfiles/files/43460871502.pdf In PDF document text
    • https://lanjutpt1.com/contents/files/tukuvagesemefuzaw.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9918ed0c8f9f4ecfc2ebc3b979382cc7/29210676591.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/piviwogenesopas.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/lelubujowipiramarivud.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/kojusavopuxazasufokosi.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/jozarexigaruli.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/97057698989.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/lugisuratidazeboj.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/xuzodetaxavupusurokibo.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pipifijagirejil.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/85146129311.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kikodememazeze.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/47455091731.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd774d17f---42226184432.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16fcd74c6---11416545742.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219244446852.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/15722294397.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/rugasorelapa.pdfIn PDF document text
    • http://egitara.com/upfiles/files/50624327839.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150fc485a7bb---sedipolugutedugewusoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=family+guy+bird+is+the+word+gifPDF 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://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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 18580 bytes
SHA-256: d237bb351a5ae6b00839497d81d39b1874aabec6975a6a8e49a024eba08eb4bc
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 11116 bytes
SHA-256: dde7373f4c4c2e32df7009f79f0402aedf201b3a3ea78405610f1a6e41d5baab
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1