Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b144dbcec685e6…

MALICIOUS

PDF

101.0 KB Created: 2021-09-07 07:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1e837f35422f9f20145d2edab38b361 SHA-1: 982a4419955126435f3a77a5e64e8b1a4da2f555 SHA-256: 70b144dbcec685e61f51a6181ca0d08546d762c2a1f42fedbf13f3cd85175014
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The primary goal appears to be to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6cd267d7e497754974a77bbba5f6251a/41346222773.pdf In PDF document text
    • http://stroi-sistema.ru/img/89491887715.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/puxobadurigoduta.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0b386b6d---zojimigaxoxo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fc1c9deb1e862ab92e34430859ebd32b/95366587907.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/74896586905.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/37533779854.pdfIn PDF document text
    • https://digireg.pl/upload/bamejifusu.pdfIn PDF document text
    • http://parfumland.sk/upl/75517948258.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4aa39b2ad---vevuguginagijiwawafe.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/81438949350.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vositefejutegarageni.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5ad26329e30788ab0e8b7e2696431740/vakuzejojorobiralekugiwow.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1626520780roxaxadakejo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c480e4965---xadijulet.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/22151717425.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2fdbe7ad---zajuz.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80712832954.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/nigawami.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/92521622623.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0286c03b4d---bugoxodunidowowomukosix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=symons+cone+crusher+parts+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e705616fa3---6405260917.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_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 20116 bytes
SHA-256: d39b2662ea88bd4cc08c613169075da1eb60b33a31329f21fa5ee3239a545355
font_01_sfnt_off00015409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C20 10836 bytes
SHA-256: 7ee9d8f27630041e814301a0d484ab3923e9f588223ddd6c67e0fbdc92f59bca

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