Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c98e903f3c5008…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 16:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0eb9a5bfc91c8196fe89410aa8b11816 SHA-1: e6a4643089d426495bbb95461522c63c9ee12470 SHA-256: c2c98e903f3c5008173bbece64dace129ed3c904c3f55c47850b780fd48b0fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm on potentially malicious or compromised hosting. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ks-klinika.ru/ckfinder/userfiles/files/13132152306.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e71b035bc1c0e25299fb8b6be2e77305/mamozupedanori.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xiguvugavikabubu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd19c622b42---23142654918.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vupizefesug.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/kuzonalowasetijiza.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080212115944.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xawipozapob.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/83382542524.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/21efspvcq3g9t2embftevco340/66225934323.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c19f587b24269f9dec061ef9aa1f8936/morawirabakagukivemobed.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607071d7d102b---38955394440.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/debuwitunugegare.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b7032eff---noladafopenulinil.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/89996190491.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/27675631582.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/5657914fcd1ca1022fe47f2f1a31dd1a/86515417795.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/31339000586.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/teladid.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/57snqjkkev13jciv1n1r0531up/wazedo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jokujoxu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u5mm4399mltcjr44bhan777vqo/neparupiwimukariwas.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ad19263f49d2edae8ab6d7934c0e90c1/jusepemujatim.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb0637311---rikelorepep.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074012b975bf---89729682961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bosch+dishwasher+user+manual+australiaPDF link annotation
    • 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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 10876 bytes
SHA-256: 44e5fbe48aa6606446aeb1abf5e5a44834f6a8f05e97756204f325083d5712f6
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 17580 bytes
SHA-256: 23d1afc5641bb357cdd511c527671db5941d0e9551dae10468a240684b9d78b8

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