Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d849907d6989e4e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cdfeb3d71d6407844d7e58b73b538a3 SHA-1: 38f784009a3bd31d9075272642770f3ccfc65cc6 SHA-256: 2d849907d6989e4e41ddb0f478e40f744e48fc55613486b1dcda63a34887ec85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=percy+jackson+demigod+diaries+pdf PDF link annotation
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/67150097525.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/lerawavakuvewale.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/gisaw.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109052324519240.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/94623692325.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/jifiwewotawamulobusadigoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394373ed8d4---sonegal.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36740205225.pdfIn PDF document text
    • https://ysh.my/userfiles/file/50339018915.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/11803095439.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328bfc2ea40---jevelinonit.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/2082910102.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/50262938473.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bemazimekubibexolise.pdfIn PDF document text
    • http://js-space.de/userfiles/file/77688238464.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/95389428206.pdfIn PDF document text
    • https://campermagazine.tv/public/file/mofifojesofogedata.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/97487144480.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/sanozekef.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109161534293537.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_8DCCDA3675CD86E3.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196226355874.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_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 18384 bytes
SHA-256: cfa82946c8ec6bfe160bc0fb61c3dc6bca79195f684458874a3d516b5547963f
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 11156 bytes
SHA-256: 7c921566412d920ad9979e2d4ad9f6e66039f52b158012d5c6fcc54f6821341b