Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb088f7364b9239…

MALICIOUS

PDF

70.6 KB Created: 2021-06-20 20:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9870e711098d77f23d101a4e2579aec9 SHA-1: 0064e23f1ff46154016f5a9f8ac7fafc6426d0bb SHA-256: 7cb088f7364b9239dd667cc8f9feb7cc4d5bb9745194fa63027993b94692cd53
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The presence of multiple links on disposable hosting and the use of form-upload plugins further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a983fe91d58---babepaxasunojekunobeborax.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/71750628087.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0b4r862v8lt2408chgu5lgkvm8/82441905554.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9hn98ihi1euoh34n0qnosuviir/38478674410.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/79370463856.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jafaxolerotarawatisexa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2a0eb003---59685617051.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/duziwa.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/96072188521.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/popg7n2096rtfiu3kg49cm9l70/pagomewuterinururiredop.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gapogamopuw.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/91008047426.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e2524675---kutesoxunigelok.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0c90303a---14365185878.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54183a3120---55756222744.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9033f88e7d5094a0e0cfa7d3d1d4f79d/jizeparolakaxupitimuxin.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/rixikifuw.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d48000b21f1983e50406bc1f407a1f82/1784449592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=parallel+%2526+perpendicular+lines+worksheet+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 4496 bytes
SHA-256: 02119b4bf3a4684c5aa1cc040f348a4fa18f9e67043daa53c1ae37a6d4c24f87
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 21796 bytes
SHA-256: 4b45cbf191b524b50c125f4dde22924be53386b278f277e2a1402da6d2726e19