Malicious PDF — malware analysis report

Static analysis result for SHA-256 da68d19461acc337…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 16:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4d77730b21b2d66d5be6a6917a49d36 SHA-1: a86565bc6ae5a49232fcc549bd284e7400ba6793 SHA-256: da68d19461acc33745943c0f36a87fa02963cf8c215d7c0a7d3a5f9fd2b64631
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of leveraging compromised infrastructure to host malicious content.

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://myconnect-thailand.com/image/upload/File/77208261347.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd1607eafe---29097474017.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/moe8kviamrgvcoj46j263kjrts/tododogadolozevit.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/temusoki.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ecjqke09dtps8lf9pdk75r9ran/rufolupepefefarogig.pdf
    • http://jfhcoaching.nl/userfiles/files/83248303513.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cbd203f---76758569982.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/88613034833.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/tujisojozadefef.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983808ee21a---bomuxugobos.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718efd1fdd6---kegumufi.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/53046973466.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7ju0djamfud8788jr8vua0ncbh/vawiresonosolorerafebuni.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o0c2gnp8d16662iqe98mvuph29/2705989155.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964bddc8f2b---rejuf.pdf
    • http://eprdel.cz/userfiles/file/60122138253.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc2dba507---72905847036.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b76616132336eb635f08cab80503f234/16413193557.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2632de4f4306159af61a88699c039c3d/71495270626.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609547d7871fd---22149324666.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aff5121341f3d262f26579560d2ddf7f/rimiruk.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/015f85f44696f58ed501d31b8041ebb4/66791609461.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e924290c2f---84653474518.pdf
    • http://arunimaflavours.com/userfiles/file/tozajawajubatapevezifaron.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/69406530110.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mass+from+volume
    • 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_off0000f0ab.bin
ad8d5d71d30dba3cf51689527d3c88cc55535952dab5c8a80202f1fff47ca3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10240 bytes
font_01_sfnt_off000107c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
font_02_sfnt_off00011fd9.bin
aa3a48c6a2be62945bcc1a6cf23aab4e7a11c73c1c72d4fc75f7b53fa1ce7e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 17868 bytes

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