Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32e070fa389a3d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 08:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cdd691d9ad1ab1f54bc6c4daee042ec SHA-1: 4e480096e84321585c9ea4a261c401090467f990 SHA-256: af32e070fa389a3df1f539edb290db3a6cb7896f9968b4c584397b9791522a6f
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, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=free+fortnite+gift+cards+codes PDF link annotation
    • https://ski-valloire.com/ckfinder/userfiles/files/sekodifite.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613924c796599---konujixaki.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wodabobake.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5m6gaqju8mi3eg1v5dj4db62r5/62354120985.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94119619079.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lakivabifapusotela.pdfIn PDF document text
    • http://pedraferro.com/files/files/57204988684.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/40217234680.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/silewujamesoti.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/15333999937.pdfIn PDF document text
    • http://vpsystem.com/files/fck/xudosal.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/mowarogalaxamutarag.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3m9qc97fgkknaaa5d8ftghi311/powedor.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/boleri.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/sotutumasobukuf.pdfIn PDF document text
    • http://emeat.ru/var/files/wozok.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/mukese.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ccrl2fqvs4m8qhvv5e21rv9p42/28664448908.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599541b6ee---wakavewufijixidazabaruz.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/jubugoxi.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xikerudeboli.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/7611953401.pdfIn PDF document text
    • http://bushurov.ru/images/files/soxetopopopudib.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/jogasizisepawos.pdfIn PDF document text
    • 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_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 18184 bytes
SHA-256: f86646adb958f9ce98e238d7d6f2be4628f9c8c30eefeecf5dcd0afa5d11a8b0
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10580 bytes
SHA-256: d86c6b08b32d7d38f6ab559ef2efca719a6003199a2dc801ea4fef63f986663b
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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