Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9b5a72a14c13e5…

MALICIOUS

PDF

99.0 KB Created: 2021-07-06 12:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f35228c313542c014feb2104abcd2cd SHA-1: 12c53006e71ec7ab665950abec46cb170d046972 SHA-256: 4d9b5a72a14c13e54e8c6b0b6fbadec87928eba8152ecd5ad971c5ce341f1717
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. The embedded URLs, despite some being marked benign, are part of a larger pattern of directing users to potentially harmful external sites, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858ec0e2d3b---73528994616.pdf In PDF document text
    • https://alutat.com/data/file/69966955204.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/95904800834.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefc92e1ba---49437491261.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/2785769734.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/32951225450.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/genifoveli.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5gm543563cq5lpgc3vncaf7qp3/jirodikaluvogoxajufumolam.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/48001395057.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ibltgirf4f95dgaqnurl3odl85/gukilevirebubufavijisaniw.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09d7657b0---13933639577.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e9a60080a19c10b55632a750b7cab0c/19053573720.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ce35b678---67974358204.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210617092801_powdfi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/632ef4a9bb20a1b6363376e3d2eef4c3/gozopetogizuk.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zokutifafeno.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7mvaffkat69dgte5mcnikm26h4/lopasagexevutorun.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160876833266a0---pejelaxoxetadimetedug.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2p7ll1i5fq23viiddm520t1n91/pakifevejanulesosuwi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82bb48c85a7b3da1abed1b59957a2824/dadunonajixudole.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/dakajobonimuvaxisafel.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/maxuxaviwigogipobi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/298770b90feb7a14e51b16091f7e1477/85389788469.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adfafd2a101---44947988847.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070c30049e32---18624996925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pretty+little+liars+the+perfectionists+online+subtitratPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10932 bytes
SHA-256: e407dcc3b9302832088b1d4d34d20c0ce53bb83b9f575877b5f3576718131ddb
font_01_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 16368 bytes
SHA-256: 49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f
font_03_sfnt_off00015001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15001 17336 bytes
SHA-256: a744fa2cd1cd86ff9b19ac80a7836e8a65b636f2290de8bc6485625a5a383bcc

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