Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb11665e646745f0…

MALICIOUS

PDF

81.9 KB Created: 2021-06-22 19:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d3d8c3ab465e2082697760d34ff2617e SHA-1: 409e736df6ed823120d81a5b5a5032a69ac4b66a SHA-256: eb11665e646745f0919836fab69523dd24a285d0b932d2102b2e92a21f982fc6
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e83ca8de27d07fdba34e92e1c103571/83757146251.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3lmjd84jrh391n4htul23uaqkb/diwimazeteratatalub.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bc05906---42213754680.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3798a8c2---sonupixefule.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bcf09a2370a5603b35cb0dea637e9fcd/lanipal.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a261780d69af94f9155fad454d1eee66/zerol.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071df628fc42---38383796974.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2580fdd981---xolorevizumedawafesexav.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852318badd8---bozepukofijo.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6e6e06e83714d6732d21f5ec614d48d4/vebegonubiduz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074996ea1805---fuvusibefij.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/gojutadoze.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/giwejuzudanesire.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1c1a9a2f---kukivurexoparaz.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wavinidovutuxiteni.pdfIn PDF document text
    • http://biosite.ru/images/news/file/32739736336.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021682157196587.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=perfume+tamil+dubbed+moviePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/01dcf7e0a9e254fbe46a98cd3401ba31/tosijasom.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e190.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE190 14896 bytes
SHA-256: 3a523d185cd7e03a5246e00dde66864780a83000f0a3f054fd86d29a4b285c8c
font_00_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 5076 bytes
SHA-256: bbae4aa051f6e1cb96e04221a375dceeddb436d4f258241650ec9400c4f5f7f2
font_02_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 11196 bytes
SHA-256: 1525a49ef0b71fd59906a320a6a5f99da48a0ebbb1f8de7fcdfa69defc46e00a
font_03_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 4076 bytes
SHA-256: 1467ccb2cd90bf03df9ce1858c0d1b71c5385543e3c03ad134a0e324bb82f968

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