Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e64e81e540772b4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 11:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc0d34f2e508046a9944f2c4b2331142 SHA-1: 56785c2add36de4f56ac0daecef830c98a33372c SHA-256: 5e64e81e540772b45397eac7aeab95e28253e958a60a3f07a391a187c7cc1b6c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://studiopignotti.it/userfiles/files/85070366737.pdf In PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/lulupovetixuwakarik.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109082257347761.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/49833648289.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5c4e47260057c7515c7b74e5e1abdba/14507018240.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/46637604653.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/naxamidizasaxebakuvidet.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/61543360753.pdfIn PDF document text
    • https://asken.as/bilder/file/10866513776.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/bupulodexuvadule.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364dea16925---70345793674.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/30764530943.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/56452382488.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xopodazerazedejadikatej.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/99285741181.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137866a164e9---lagozagenozun.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rojogiminapobanuro.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/dulupuvixevalunurasixod.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/30549129928.pdfIn PDF document text
    • http://195exim.com/datas/files/juxoginebuwu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/pisukaduwix.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/guwigapezijufu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedosagamedowutusexukixi.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/worozibukiwosalepe.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/56483887406.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/jijexexipasisigazalofa.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/73559881689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+run+windows+on+android+tabletPDF 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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10560 bytes
SHA-256: 7d24f3879c6220343ff4a66ec349556f8c0b2491ee70e89182dc9597202ba6a7
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 18292 bytes
SHA-256: 36dc20e7e622ba4014b9b0e0c4d4d5f67d8c1ecc9cce4e32b7735c3bd2c3ee4f

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