Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddac67ba674704f5…

MALICIOUS

PDF

91.6 KB Created: 2021-07-24 00:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e09bc6918dd4e2dbfd9c9b2dd61167c3 SHA-1: 8702a6d9afd2d1167c5879f6932ac41b603f9488 SHA-256: ddac67ba674704f530ed82837f53fb157bfb83a28a37c01e7f07451864c4b72f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6ed942d3---58234882536.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7b5711b02baa55617ce624aefd92faf4/nedavimilikuginunef.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6476eabe8cd903bf3a0727a585dd8ddd/rilujazokozavufivaxasones.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/59516986306.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/510fccf2301efdbb98bd021492fbbd14/nikowoxatixezig.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vobepuf.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34860552969.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kt17spmfasfjtkm5mq28spb7hn/jovilomomazejileza.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b5902799---bifanugesinirijerasavu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/dexutadofi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8890e251a6550deda9cadd6c7675b6e2/76865932888.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/91cf522de993b8320312eb7b0a24a68b/vemevikejuvazufoxujevozij.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sunaxunemijatejasi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a56f22722---97110594923.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/30163185133.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6bb5856b---pebagibusugavalir.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/12240002901.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f55120a---fijuj.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/vebapimunulijakufufumaka.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/purutaxibozogijed.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607143cca5a6f---pesasutexenelitefizoroli.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a995392c5---dezumerarorijelebevetowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+install+a+tankless+hot+water+heater+electricPDF 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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 10496 bytes
SHA-256: a694dec800e1816127e464b34db88099e9e31176c57b82994247d90c5e23ba20
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 17236 bytes
SHA-256: 22fd0b864a855026c23d05d03796a259c95f9b1031958addb477faad722335b6

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