Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd238248e2b9a2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 09:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9807181702580d86bdac88604acf4333 SHA-1: ba86e5a3964753729551a569999b5fd57248a6c8 SHA-256: 99bd238248e2b9a2aa88206629d3e61dc842d742ba1add6162a6c2bfba490580
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an effort to obscure the true destination and evade detection. The primary goal appears to be directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=pubg+lite+garena+manual+download PDF link annotation
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/39448270872.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4985ee7e8d1d855b941474b0c5f45769/velovazevujigar.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/388790221.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074493b2ad12---sexoni.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f4b3859939d735edcc15462380d73d52/pipanijiwigi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad25aebcd---gexiwidebugigapokida.pdfIn PDF document text
    • https://nistd.in/userfiles/file/nemugas.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/65866428049.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/remolon.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91c67f97f---wezawamen.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/36057303424.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/821b3c85b27c316264fe7731181d413f/31455685560.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5fcd508e2ac76590d495858bf979d84d/11169871029.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/zoposajapamupuvonuwijog.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b1150cc5af5ba07e7f353e475be83165/kozaseraja.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/92876110449.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ffa4cb16d0777a3d95dc0d89a2b03c9a/lusonepijusitikudan.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/75572068304.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960610316d8---37479855391.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nisid.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xujiponexobote.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ae47730e---gajivivalu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/27634162538.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/folojiw.pdfIn 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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 10748 bytes
SHA-256: be32d67a06bedee6a50ba124190fd566d1049d7d18f5501e9f1afbd178128e85
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 18944 bytes
SHA-256: 284e8d65bdb9530b684953c3c1a24dd4ff40e3359c84c08f612d22772781a020

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