Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a314dab323a4090…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6235b382bd4cc248efcd23b0bcf9f2c3 SHA-1: c77358ebc068ecc2a5f53f537c85ee46142c9ac5 SHA-256: 9a314dab323a4090971b35ff5d1b5f780038149620faea6affa594a23a3edbf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs that often leverage embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5626

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=super+mario+game+download+for+windows+10+64+bit PDF link annotation
    • http://eva.am/files/f8d7e0a554a9b90f.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2bcea66e59ea2d40f731b36e2481904c/sobuduguzekegudi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zuwul.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46501084753.pdfIn PDF document text
    • https://aayams.com/userfiles/file/67107094998.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210913173703_u4ocir.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/76436558707.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/90300634827.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67123189295.pdfIn PDF document text
    • https://ksboutlet.com/file/files/4024106075.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/88821446525.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/gunivilagoxim.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380e676e7a5---40096081031.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zikekotefavugopidadisuluj.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/77506608755.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c42f3dc8---30902258888.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/30503795789.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/82928934264.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jukoboko.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/56183345302.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/38472042367.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 11664 bytes
SHA-256: b7a7b77251e7a0ab36646a79e8e469fc6d2297b36e31fbc7ae3d8618ca133531
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17800 bytes
SHA-256: f92397edbffa6cd0c757c31bc499e3759a53fe4e1c1b53519c75ea24ce38932d

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