Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e4ca14babe4ee6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 19:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b52e79724661e2728d419a8106fdab SHA-1: 7f132599d25c7b56d03fd909dd22d9e68fc0da37 SHA-256: b9e4ca14babe4ee63fab8c53c6bf4a674d691aa1304622986f9243cc6e8e7b42
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=highway+rider+motorcycle+racer+apk
    • https://investkwik.com/userfiles/file/82215327511.pdf
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/29836068735.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/de81135a41373d61fb1acc03dd9868e6/xulojuwopatasuf.pdf
    • https://pecsikult.hu/files/file/73429676907.pdf
    • http://arablift.net/userfiles/file/56985996635.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336ca70100d---35779658713.pdf
    • https://mangallagn.com/images/file/sifabonon.pdf
    • https://mayphotocopydogia.com/upload/files/wavevuliwigi.pdf
    • https://loyalangkorapartment.com/userfiles/file/85234878951.pdf
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/kajus.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/90bc6ab57fd73d60770b2b54470cf9aa/79609140282.pdf
    • https://gogift-it.com/userfiles/files/49827685539.pdf
    • https://serviceservice.eu/userfiles/file/57961313767.pdf
    • http://ahkjt.com/upfile/file/vawivazaxab.pdf
    • http://siamintertrade.com/file_media/file_image/file/86804700659.pdf
    • http://colantuono.it/userfiles/files/7095098837.pdf
    • https://ngonluathan.vn/images/ckeditor/files/27264392528.pdf
    • http://sugarfree-gelato.com/upload/file/4208171718.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/sorugat.pdf
    • https://tannhatviet.vn/upload/files/jowadowovupijupis.pdf
    • http://iucecb.com/files/file/gasunilosa.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0d04cbf1---29446031801.pdf
    • https://laser123.com/geektic/files/50562908823.pdf
    • http://focalthai.com/file_media/file_image/file/43203194563.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea2.bin
ecc8bac36a9be727625a453e58b27a0ae82f678f966af6b656a2571863dfc914
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 16932 bytes
font_01_sfnt_off0000fa47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16792 bytes
font_02_sfnt_off0001125e.bin
7e39f353229d0fdc9303f98df3c2ab2a4336ffb47b7430a08577a89f213c0850
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 10972 bytes