Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09d9e30fdaae9f0…

MALICIOUS

PDF

94.6 KB Created: 2021-06-30 09:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 082e8fc986a6e021f2c41508dcda51dc SHA-1: 6e76a564f2adbbfda46e6095a8b3b63aabe80067 SHA-256: d09d9e30fdaae9f0845d49e18d651c891949289b66ce60eb65ecde6c70e7868f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, with multiple URLs leading to PDF files. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d2686ec0---79491825914.pdf In PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/22rao4ersaroes6u1rmgobmbhs/88547244204.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080180a1ea4b---vusuxijava.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077585d377a0---47273421820.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/27742136859.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae8a58eb4---zedasikuweduwogo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609669d9c66d6---lutusojopamusipirorum.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8981ba7f15e4470c6bd32dd5a894c7da/sozajefejanemuliv.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/26730147187.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hk4nearvho2du7egmv0jfiq6t2/xixilizegojonorojagelaga.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/57205042687.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fuzagepejanegivaj.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd80a6bbb---noxutow.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f3b2c89e---sudodederer.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d1fbe8b6---sawelixegukore.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608066eb81e17---24863719645.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce8d339f61ede73c83966c75a0fa597c/latudogimadusakakifevisi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3f0aa5f45c2a462dc152aac6777d7bd5/2507471183.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160789c33f1306---51678427228.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/08056d04172d5bcd05f358b1d1460a7c/91521518251.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/37409406099.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a29eec19a7f---mewete.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/fatujogonabesimitasaruxo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/taxolozuwudokitigize.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/bofiriwinajawulozuvegeriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=balancing+chemical+equations+worksheet+intermediate+level+answersPDF 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_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 17768 bytes
SHA-256: cfc57dda01536db84698b831d9b8c9f6f37e2cf37c8e69fa440a65e6b70f7616
font_01_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 11360 bytes
SHA-256: 80f870d8f178d00a1278962525898dc01d408ee691b1ffb9006eed91b8489cef
font_02_sfnt_off00015228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1