Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b6446d486cf031…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9333df862d0e8200a4620b85d4a05ce3 SHA-1: 607d09f7a37b040a1f049d15b48afd92ca307109 SHA-256: 39b6446d486cf031215f7f4cfcbd3be770a9b2aa87c558c5d37a7c75533dc6bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the presence of external links and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adance0112.com/upfile/editor/file/65102821303.pdf In PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6pidkphq04nnp9qt3ga9e078bd/kemewudolerabidusa.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/52054709765.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfe3a9453---kekoxutezapovi.pdfIn PDF document text
    • https://lordoptika.hu/files/files/58950330628.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/339b5015f240636b6253e622e9dee0e4/garuxewekoxudulubuzi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dd91c599a---zawubofajilodixer.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2cf790413baa40b55dc321c94ccd61c9/21410349555.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5184319ac155e4c1dd2228402a682fe8/votumerexaxekiwojolon.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce082d6d7e---25555392778.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/sibojixukepipofumuvov.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/jeluzuvixes.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/42378370430.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142b2a3ef89---28372168841.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19c736ca2c---favadefikum.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624010835.pdfIn PDF document text
    • https://airbays.com/userfiles/file/62165928368.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b7e6568dc868b36b80fd88b8d528abee/53099612593.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/54f012991dc9d76b8503b8c06b22178f/tapunoperikimegab.pdfIn PDF document text
    • https://best-label.com/upload/files/88968198140.pdfIn PDF document text
    • http://svx.su/ffile/file/sejuxamisona.pdfIn PDF document text
    • http://platcometals.com/images/file/kumoximikutoraxis.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/84721196774.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/waxarevu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85581254227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inkubator+mikrobiologi+pdfPDF 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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 10824 bytes
SHA-256: 0f314588b6d4ff6a0396a910afcb9230801fa965f4f369b508e371822b0f9fb5
font_02_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16832 bytes
SHA-256: 837c1849fa1bf35cfedbf9a8309db00a3011409cc8decec188815d657934ead7