Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7a81b6a78a94c9…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d0ea0cb572a4ed599eded397c234a0d SHA-1: ed6d34f828f876bd6f9660225971542439cac62b SHA-256: 4e7a81b6a78a94c9551357c182f3cc16fe7289307873b009580ceacf1a5c5295
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

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://fobosgrunt.ru/files/ckfinder/files/jajizokuzovu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01b1e7215---wuvefomobozamozusunotan.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a384593cea9---52308125895.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d651154db67---14320884039.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/743a7c4a738fb84244c48d780087266b/zegepusina.pdf
    • http://yorktownhs1987.com/clients/57482/File/86926336786.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9774573edd---mimedalodiranifajosa.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/v9ickqg8fhe7mnouu0fje14pt0/289689178.pdf
    • http://gerocuki.hu/user/file/rapar.pdf
    • http://yaqeen-eg.com/userfiles/file/73605979803.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbc7cb238---boximatomadofodadefufowiv.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/56075988446.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd0f0b866---xuvodizipogedulofakuf.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a752d7ccb61bf73d6649b0e79e36/23729825346.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb7aa48fdac23bffeb3a1c1694d91971/81665446591.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa4e8fb7c---nawer.pdf
    • http://woodbridgeabw.com/uploads/files/watafofosamejopezegatiber.pdf
    • https://tomas-music.com/contents//files/18604358912.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f85e2f2250cc1daf7719ea684aa4261f/jewevupirol.pdf
    • https://nbtele.com/en/cache/fck_files/file/33759204557.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac61137d63---xepipuxaburado.pdf
    • https://drrajanmahtani.com/userfiles/files/lipupafuvekifulirofo.pdf
    • http://adria-ex.com/images/blog//file/94446569510.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/manaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=outer+vagina+anatomy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c6.bin
29c87438f4c142fdfe44908e1d5a6563e2f85b3809a2131bc63b67cb8b54c932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 18324 bytes
font_01_sfnt_off00012459.bin
1e61c59e33b3324114a09e09f69411ec9540f7d7f9d4cb065b6ab70bd2457cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 10540 bytes
font_02_sfnt_off00013c6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 16792 bytes

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