Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3cf5eac2b03e37…

MALICIOUS

PDF

73.6 KB Created: 2021-07-21 13:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6478962787dbbbcce1eeb3a24e7833b SHA-1: ee695710cdc23dbacce0a8dedffe45c7ad1f8b83 SHA-256: 7c3cf5eac2b03e37dbdfa339f6b480cc3fbddafc721e6287b56efcddd169884a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://opusincertum.it/userfiles/files/22801039701.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57a3ac3a1---baxozorovafapekerawokewun.pdf
    • http://ipost.mn/ckfinder/userfiles/files/59970606447.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f202a66a617---jipijifobisujasumagelela.pdf
    • https://haysalon.com/public_html/userfiles/file/11847071325.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/nezem.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbde260838ec1a214c452caa40e8015b/zinawidasadawanofijorujew.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/162490235434.pdf
    • http://dongkoo.com/uploads/editor/files/bazujinesumusunibavovejo.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8a8e776b58d89bb63ff50270a34a2f57/barikidanigeragib.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a507b9c890d---bajorixepaduboteja.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tobodegado.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tsvto390k43og7nl2fa9vfqssc/1098133949.pdf
    • http://sklepjola.pl/userfiles/file/6747948096.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hgbtqlmool0lgvies6143t2vo1/47491803322.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a8ebdad43902791e8e1ed1824ca8c27e/57658779749.pdf
    • http://unseenadventure.com/userfiles/file/sibazetelos.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cd5df1a---lozenaxukedabipap.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094601c31db1---woxezivunowubur.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19e41980b---lejumasemafubetovin.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/722ef7900ae8ceef8abb43b0949ec4c5/xulilavezi.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed103ac7844---tutajapoxuturumajigomiga.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0050e312b---18990334320.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b310d1da241---3576201451.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+american+crime+story
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
font_01_sfnt_off0001079a.bin
4dea8c8aae9e1cf27d5aaaa2169c8ff98ecd656d4433232ac0811822dfbee296
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10524 bytes