Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de53bb4f3770de5…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 01:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca359797753c254e288b5a5a45bbd0c5 SHA-1: 6057cd4a2c1fb4cd373f1dbaf6c489570c25ff9f SHA-256: 9de53bb4f3770de523a897fcb6d3c954e42a351336058691f87f660f70b1f863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for malicious SEO or to redirect users to harmful content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://fajanav.com/aym_image/files/88986679269.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606f483337069---rifofot.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/82392772810.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6c20c5f3---35473655984.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/dh1193dcef8usbtvio5m488elc/70762266448.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zojoxixovorujuxipejuj.pdfIn PDF document text
    • https://digireg.se/upload/93911960619.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210610163808.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/15192547991.pdfIn PDF document text
    • https://isleo.com/i_photos/file/9190800407.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jexevonozogav.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/fejadobakamobaputa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/18ab5493d6b5ed3e289d0576de089b12/xifobetunisekamikapita.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f32a7b0a26a3a63a0b0d272bfb51ccc/13387750644.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe34d2458---jusuzubedixetum.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/sajujasakafobigo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730c4411704---pizizasozi.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/61212598071.pdfIn PDF document text
    • http://metallpress.ru/files/94166917787.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b26358950---66129214394.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/280427127728.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021060916232289659.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o4rbf2n7fl6vk6ln6gphujmtsf/kejuxazojoju.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/01146bc9428a30bb28b3c5d1a9ffc3cc/nifawulewetemifi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16083a56fe3227---813608893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ms+access+cross+joinPDF 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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16996 bytes
SHA-256: 97dee6829489da33b5c2251b319381a121949f75bd448493dcbea3a67ea5ed1d
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 10204 bytes
SHA-256: 96f323c9554e604f146b1f73034fde02fe1529f7cea9058a9671e032d60abbbf

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