Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd97b910b83b127…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e538b981f1368c1ecfc537782738d60 SHA-1: b544f763b84dc7e74e2675311f346cdd76272433 SHA-256: 7dd97b910b83b127683e876068f5b9c400cbb758b3845988c07abe326c88c8d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm or phishing attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to potentially harmful external content via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://solee.cn/ckfinder/userfiles/files/63282356077.pdf In PDF document text
    • https://dietacud.eu/upload/file/95595441131.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6379f953---sujiwemevutiw.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/pivefetediraxawofa.pdfIn PDF document text
    • http://asvpp.fr/pdf/43282888886.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc06e042929---72428092513.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/82742726412.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7af44d27---minapugunidevolitopexado.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ai9hrq86u5v5lqdlfjg7m0ak3076a9oa/33793073098.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0ad15b3cbe1d67137f4e3d34e5672b54/rujojimavijid.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/wetubosarixale.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/mefetewilutasina.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/067c6e68c8f4340352dfaaf48e27d312/fezunanulunupuzukibu.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/vakerev.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/virawaxodowawasipola.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a3c8d0d31299bed35dd73054f5fd195/71127156695.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/gakomidatekuzutiwewoma.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/kesapapetolupixiroj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/7298833312.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lisuxisag.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983640bc7c2---bipegosaw.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff2efb9d2a---netipaxixemuresogofago.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/26qfeam7v5piroomq5c1vuh8t0/runowijilufaze.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/76458340216.pdfIn PDF document text
    • https://palet-school.com/files/files/tobepekulukoluz.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/19895678475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=suelo+franco+caracteristicas+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_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 10788 bytes
SHA-256: 87a13f2b172de474920e7de875aaab85d15b53e692d1f0af850fe61be5e3c141
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 19688 bytes
SHA-256: 9f3d211a26edb69ce805483315769423bdebd921164e8e636392ed809ceb092a

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