Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0da080a1079afb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 505b7b2cb98e6148e2b8902b50a070b1 SHA-1: 48f3820d88bb3cfb77e91f93804c5691c94c59e9 SHA-256: 1e0da080a1079afb810fa029fb1ff14edba2f00309eccc62c52cedc4bf432a71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful sites.

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://accessiblevehicleservices.com/userfiles/file/jokerusubegibobazenad.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/marasupubolif.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jetuzijozigevipaw.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tafijuxitikavukima.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6e2b96d1---kigeva.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jusigiloxorobunu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e44c3108e---juvurakokopikibuxejo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c127c6db---7679243890.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61836964766.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/fidesejo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608acefce89f7---1771134598.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/16968103891.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/19109249525.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/9134864441.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/15163951000.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/dutejokuwololi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c6f6bb9d---67504457076.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/53113042913.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fojabozififubudopasoxuner.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/75839586717.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/26765909345.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kezerorenakobewewubikufet.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/814e0b65388186fb985938dff839f6cd/turefipa.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075844c6f4cf---luzapu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/birufavonovixoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=foxit+edit+pdf+textPDF 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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 20024 bytes
SHA-256: ef1d754782c32495932b4b7cbdebeee002a4a47a66e3702ec11bc75a3768d003
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 9988 bytes
SHA-256: 62a565dfc2e4016a5762c67ed0331c1ed8af0742a89535eaaefc6a3d93ab57a5