Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32c1d9f1193a364…

MALICIOUS

PDF

121.6 KB Created: 2021-06-29 11:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3238dac1e8d0fc92cdf6d9c747613b SHA-1: a15bae802a352b0ef5c187550b4eb7d44b848761 SHA-256: a32c1d9f1193a36465ac210694e9cee46d3b42aadda2386d32524abd81af52c0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting users to external sites, likely to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://gpmpoolandspa.com/ckfinder/userfiles/files/22944199427.pdf
    • http://highendschmiede.de/highendfiles/file/80971231216.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/merovaluvizo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4aca3677cdf8e548621c01cc6777ef10/piwuwuvegefubajogaleviki.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/lrnb7qggnv32lcepti17njo6tg/14773426863.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d32ea316---70887533589.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/fokap.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608451b017ce8---nafotonapilubof.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6f91b996---5482100572.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609380a14d2c3---xelufogopusobisiviz.pdf
    • http://taiwan-casters.com/userfiles/file/kijepudazuxukigaforugexuj.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6680b62a0---sisimava.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d23f2f2087f55ee0869ea2e0c0fab3da/somezafales.pdf
    • https://theatresaucinema.fr/uploads/file/fotupimaguvisuxigedan.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/533d146ee3cbf93725e51db42545d281/lepetesijiritufi.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608854dee60ad---95570212530.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dc46e849a4a714750c0ca4efbd616092/vodogokofigaverorikiniz.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1bb746044482e3e68f6ddff99d49b7e0/4008539503.pdf
    • http://ecole.ru/text/images/file/pidoru.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/87e707a828bf092bec3371bb98d255bc/69869767527.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f12c2aa5---29370890822.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f1e817b5557c874682b36c38560873fa/paretopisadimulid.pdf
    • http://qytbearing.com/upfile/file/dunagavejevebedidexuso.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609921c4138a5---sodemijexinogar.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8340a1d5c---varovisak.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd4aeaa4f508320bf8149ffc8c8b80eb/kaxatabatejigexebibunu.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e476d05f---zuzos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=principle+of+states+rights
    • 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_off00017848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17848 16792 bytes
font_01_sfnt_off0001905f.bin
9bc435851bc1ab797a55db2e734400a7eaf81c2ba28edff79a4af6a01adc7ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1905F 10760 bytes
font_02_sfnt_off0001a906.bin
c0ed39a58353b70d7a4601e35a899c4493cf80891b1e08c0d73b9375bae22c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A906 17688 bytes

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