Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f50f60c30b3ea51…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 12:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbc3802915d84f7e362b58530cc7aefc SHA-1: 10df146d5e9d1053ba651cc9b1d3045406c94ff6 SHA-256: 7f50f60c30b3ea5165fc76e61f403f35205ac7c7aee3328646cd0c41c559efd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=conditional+clauses+without+if+exercises+pdf PDF link annotation
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dazaguzuz.pdfIn PDF document text
    • http://ty-int.com/files/files/vorejebimabenimobosof.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66665924630.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobafuvusidapo.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/ditefilovevejodivowazuz.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/70584087991.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/resubef.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/jifedazapepupe.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210910003437.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/8310822547.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090419030411.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c62f4eb707f4e84d09e06737b77e5f53/87813134917.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xigoneze.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/225gcr9ctn5b4ss8ai57jnddju/51244043527.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/39824110803.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/dizel.pdfIn PDF document text
    • http://stefani.cz/fck/file/8655669868.pdfIn PDF document text
    • https://salwangurugram.com/files/20594800385.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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 11036 bytes
SHA-256: 8dcb40997075fe982d8acc072d58664871e3f756446910a4e3d6ee30058388ed
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16852 bytes
SHA-256: 9a4abc4b9177012afc5ab8d0bbaaaf3be6216b46008fc7dddff1c23056df0360
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1