Malicious PDF — malware analysis report

Static analysis result for SHA-256 c257b2eee324c066…

MALICIOUS

PDF

103.8 KB Created: 2021-08-26 18:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91bb9a55c400fb3741b40ec336d219c9 SHA-1: 8981ef5694577551194305a7370cc553a0f3838b SHA-256: c257b2eee324c066b6bb078f8df4e53043c7a13eb06370829ab3e2be06297565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://fitviewer.biz/files/file/72123506320.pdf In PDF document text
    • http://nesthomes.in/userfiles/file/xapiwe.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/6952778365.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/kabupadozuwufu.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/28223613751.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608092444853c---korosuvarubub.pdfIn PDF document text
    • http://vtaky.sk/media/file/lovunurisojawukelefadoriw.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/56334923414.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e461337d08---69239363422.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210611164600_53uco6.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55552998141.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/96770538187.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/21989368922.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/87255250587.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/6563166318.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105e7d4aed8---sewukisukaxunif.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/midiziwodigasanazu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5kdou87gi0jpplfl6kvn03cbnq/27332728700.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3afd788ac8---tumuwifoduj.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c51607a2---xebiruwetofibapizotip.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7dc3c83950---17496750462.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/2522413471.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaddc6423---97433199695.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/2128803315.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/2708346405.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f99c3068---28295136367.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/74344498575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=examples+of+demand+curve+shiftsPDF 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_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 17020 bytes
SHA-256: 08f3e086e443ba1ebec7f97317b1a3623db2866cd3992728e88494d46bd28532
font_01_sfnt_off00015e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17674 11136 bytes
SHA-256: 4ca442656d3052a90c707417095d38d2f7440029745d7b170f7fe22d2c0dc26a