Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5e72950e286890…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 23:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d25052119cdf2a745a52646e24575ec9 SHA-1: 8fd404fd4d716f263bc39c363b9a0fe6a8dac754 SHA-256: 1d5e72950e2868908c382492b7d25b7895e81c221f6ad4425cd11b082b438097
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dtmaso.com/public_html/Imagens/file/filapalojefuvipole.pdf In PDF document text
    • http://redigonda.it/userfiles/files/86117387342.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f0c8628f---62819627866.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/67081909438.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/72622262453.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/87765635081.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d215a54c---38121490496.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fq5975env3hvu55pheqhg84iod/kafogel.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/49867051350.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5b1ef35946f8cd8a19f15cb4d82a8967/novev.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/jarupofadonuginav.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/689e30c7d1c0fea74a211d0d01d1cdef/sizev.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wanubovarol.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622512769.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopanovowawiraxitelaxa.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34527380075.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17a53633d---74447208748.pdfIn PDF document text
    • https://ksboutlet.com/file/files/guxivivotil.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/50283843779.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16120270c3b974---xujosubi.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/zofotajemam.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/54523003799.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161245ddac1628---45119135564.pdfIn PDF document text
    • https://andana.us/files/files/48204858050.pdfIn PDF document text
    • https://faceless.me/userfiles/files/80287514945.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6addfb11---texejimefa.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/16177631133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fibre+optic+communication+key+devices+pdfPDF 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_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 17444 bytes
SHA-256: 6625e0241641ef7d5b8230ea064e837197e445f94948e58929e6959c7e3b4fb9
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 11224 bytes
SHA-256: 40ccaff103ffad27d26e23349b9cedd5e1f006ef7359b37c7f5516f5e8b60005

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