Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3a7b281f2d2ce0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 02:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebee17d7d83592a848fe541752701a15 SHA-1: 21a589e169fc7b85349e3618b6eeddd71087a8e9 SHA-256: da3a7b281f2d2ce062d3f9e6f8344efdcb7b28a0a63201cdee5c70757d621420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs and the nature of the link farm suggest an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://garglob.ru/uplcv?utm_term=principles+of+polarography+heyrovsky+pdf PDF link annotation
    • http://iscyber.com/userfiles/files/sabenuruximuduwebasogipug.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/88824716711.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/62830822919.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/jasevepamanewe.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/radekotopelinenabem.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1355c27b9---73135043359.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/ruvukuwunetofavaxowife.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4300432786.pdfIn PDF document text
    • https://maturana.cl/upload/file/xorevojof.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/kenegu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ihob7vh2fa0acfre61rqmv70q3/25693714503.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160852a8977ef5---93509277150.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f66c75a412c2233a31587bf1111d961/47570719623.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fidig.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/toworofuriwe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aac6bada77---ropitomevatumisadewivaxo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9656d50e8---2071948047.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/60213454107.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/38563447965.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/fofivofatolepabexaf.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1mv81p1j77ojq8tqf30vjh49t1/depozofaseramu.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/biparevusese.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160905afdb51ec---nerajegirot.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/bafevigexaludutenin.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/55330585815.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099458018f9c---13349621500.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 11076 bytes
SHA-256: d515259a2d0f12e7105bcfed7e5e3e31b43634042f02455dfbe40c4d354f1af8
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 17968 bytes
SHA-256: cc1d06f2352bc77965dd69267047a62625ff96343f461c66f829d080f9c05fec
font_02_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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