Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439c3cea75d76db…

MALICIOUS

PDF

105.5 KB Created: 2021-08-17 05:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1fd63a6322b919770379d105ed0a32b1 SHA-1: 2e61b3de79546c30d603579fff3deb71137c3687 SHA-256: 4439c3cea75d76dbdbd14e3bc4527b1889ca5cf335ec788e1950188975834f42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ledspectrumthai.com/ckfinder/userfiles/files/tabafiwejuvefuxijojalij.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5noqm3hliuvgo91t9bf4i85vd6/5353361599.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zesekibovuvadufemun.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/torugef.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/newejosidufekunimubukatit.pdfIn PDF document text
    • https://manenshop.com/upload/files/reruvexixarazujulotop.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/fawalafobaf.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/44910721492.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dewedibibepirenonu.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/waxewe.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210805_0B72988B93DF3D5F.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec27f8d4ba---rebovizofujomowowamur.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/19428790708.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3f543b54---bovotabedonit.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a360d17572---17680331306.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/29332291783.pdfIn PDF document text
    • http://dzbnf.com/upload/file///23920381661.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/bomibiwipatevixemipoto.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093de010dddb---53846710657.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ff2bdf6---87804652847.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/gasetugalalafebebilisisir.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/bejemiga.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0367982a930a2d6b3b2da3d5294dda06/nuwuvafutevoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=las+7+claves+del+exito+de+disney+resumen+capitulo+2PDF 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_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 11184 bytes
SHA-256: 3a67e49f1a0a97c9e24a225909b7d9b3c4477c37dd52f0321228cd3184bdaceb
font_02_sfnt_off0001658c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658C 19084 bytes
SHA-256: 0e561f35fc8143783d7000a720d8ea35c572e7d4861bd9535c806b3c62136655

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