Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b5b8abfce96bc…

MALICIOUS

PDF

97.0 KB Created: 2021-07-19 14:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74db7a85c55992ff513f944ca5e73a84 SHA-1: 99fb6766ad99fa3e90cc0a2e099a9ddb71790b4c SHA-256: 4e2b5b8abfce96bc799b89d6b329e09485e316997a2d4eff61e1d692adb911ce
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is designed to lure users to malicious sites. The presence of many links on potentially untrusted hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://szsahsh.com/uploads/files/mepogowolasa.pdf In PDF document text
    • https://sabagdasarov.ru/upload/file/tovidegiratezoxi.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/23f29649392eb09db67eca91ddb08205/tonuxekamuwaguvavonagev.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/rodugapatedesazexigu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/60569561390.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200231502579.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fc313c138cde63575bdd471bc507f04b/70875903948.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12e26ff2de2734dbd3c7fb9309610acc/xezaxi.pdfIn PDF document text
    • http://otohonda-phutho.com/upload/files/21047850156.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c04f845ac---74738323779.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e027353e4---87909851345.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc04d7146---xewibexavukimivolipe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d0837ac---mewevafisebamojinuk.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a028f9b3773---84081210959.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/69933194500.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/tagorazini.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/87552012655.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/loripideredazenubita.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/69800693116.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a0c13b557825aa69bb563bacb61e4b59/xezoj.pdfIn PDF document text
    • http://snsi.jp/image/news_file/karusagegivaziwobatekaz.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/folepumix.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pobukoxogazuwajavufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ccna+basic+interview+questions+and+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://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_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10888 bytes
SHA-256: 1a00ed9a908a0643bd152d87623d9b199f5003fc4ae586f43f0228d79c5667b0
font_01_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 16980 bytes
SHA-256: b12e8ce54b8d44b1dd540b421cc522dd5fe4a54054d4515c9c150d2dcf0b65fa
font_02_sfnt_off00015ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1