Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ffb9344498f0ae…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 17:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efcc63fa52dc06286504c286cbc9b720 SHA-1: 776122cdb91cf70edc14ba34d1d40b9080c42400 SHA-256: 06ffb9344498f0ae9d37d6f429ebafb533668b97c52b70f9ffb11d734b21a2e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while numerous, do not provide a clear second-stage payload, but their nature strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lorofilmes.com/Uploads/ckfinder/userfiles/files/61587061357.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/58767955296.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/gubelozadajimur.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/86452591926.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613c763f87d12---xavomajumidulezagawut.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba8fe1e09---nifadusunekopakuxidosed.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/bidiseboxugifamasaxe.pdfIn PDF document text
    • https://sapporopools.com/contents/files/gikafa.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/vononodaxepanod.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xulakibaraligosudujokefox.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/93977565738.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/sediji.pdfIn PDF document text
    • https://penal-garazh.ru/files/82027102456.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/54686548267.pdfIn PDF document text
    • http://xfswchem.com/upload/files/33995803461.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s5m4584l3hfb2rcdu57cd2g0s5/73457765191.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e15705a3---bokojelezobebusuditunoko.pdfIn PDF document text
    • https://siroyensao.com/upload/files/xiwazawiwirosetuwikesobaf.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/zopajorewafotimowofe.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/65987444323.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2915868928bb3ca12f0e78a6e3f0fb0d/61611237967.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/50326088532.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/56393073609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=adult+apk+games+androidPDF 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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16380 bytes
SHA-256: a5b7da293424c3a3280b6bc808849933a53bed76689f5260531f684273d11d36
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 10908 bytes
SHA-256: 274791f28b254d122d560c5e8eff4d4ac641bd6ca034b38f059f9c75d9a10463