Malicious PDF — malware analysis report

Static analysis result for SHA-256 281bdb2006fb3a92…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 00:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09caa2d6f34cfc4744177068080ecec6 SHA-1: cb2e29fde37225d0433ae4223d11bc3debc7fe3a SHA-256: 281bdb2006fb3a92a705648b9e8537c0cefef78f6e33b4537353d5cbc3c8e77b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function appears to be acting as a link farm, potentially for SEO poisoning or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae637de6031---mibolarug.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ebb5954b3---68746745355.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8402953785f3d1983657756bd60d07a6/popalonogozebisiwun.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc598671aa---joruzamizado.pdf
    • http://fittbike.hu/files/file/gizapijunezepaken.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7daef45638fd1e9a09eb58ac41c5f607/winegod.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c1rlcaqn33jsi16scpc82lkss6/poxijiwofiratudapanare.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/488e912e08a834134d76db8d2f9ac83d/58561147652.pdf
    • https://tlproduct.com/userfiles/file/munovogibupa.pdf
    • http://weberstellen.ch/userfiles/file/tafowutuvesadonewumoref.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/nadexexomasuwejow.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2b6c1e1608f2e523ce60bd309e1fe4c7/bamizomuterapesiniduve.pdf
    • http://stroisvias.ru/userfiles/file/karuve.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d793de2089614a9468972b6deb0f4f6e/74916486060.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c6f79d6136d241ae7293f6bf9cb0e233/16340024400.pdf
    • http://myjobcareer.net/userfiles/file/2021071803343373499.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c212edf230d1f699de68aad2090caefd/28272649186.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/aecb36bf52244d2c9f9fb00323253161/losevowevusufivubabiru.pdf
    • http://vodnik48.ru/content/file/68213859833.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/46744059946.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c73bd3de---vidimitobupaduzebevin.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6605ac210928d0e7322117a966a66441/7379774273.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/447d2eab117564f3d1b597b98dd91328/72662557446.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+god%27s+will+for+you
    • 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_off0000f0bd.bin
38ab4a3afc06770855d86c7b62ad91aad8dcf25a807e34ce2a2a707c2e0eaddb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10724 bytes
font_01_sfnt_off00010967.bin
f63dab10527d304cccfda8bda31106536e03be8d2a8f240ac9034691ad683038
pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 18280 bytes
font_02_sfnt_off000139de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 16792 bytes