Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f39889739cbf36…

MALICIOUS

PDF

96.6 KB Created: 2021-07-25 02:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 694e1107dd0688e3ee28aa2e28a1d862 SHA-1: 9f0b3b51b98ccfffdc31f2b69f42a18ba82382b6 SHA-256: c5f39889739cbf36ab9b9c0264af48419ff4d37069f9eeeed0de04785784ce0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4ddaecf8901fe15ab031d02a97f49cab/56808746934.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6tt5lo4866k9akmhrvssmq2bt5/nikirolediwopinugavu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/11629488795.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/zojimejatisulilumi.pdfIn PDF document text
    • http://ridendo.cz/files/file/tajivavotiwezesozomu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ab0ad139---ninewubes.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ed2aaff6---zanebufamaw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc49864e7---17326868204.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/wamaromolagibepubixu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dd431ca8---35381860122.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a904290476a---vujagerebuwudiwakof.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54531542300.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/45228494535.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa05315ee---11641561702.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae7539600---65008551668.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83ae606eb---pusodoretuxawunivejujod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c4abf692---nuriw.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f3b524df---vupejolisuvede.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/faxubadevuvomap.pdfIn PDF document text
    • https://coluer.ir/documents/file/masuwuxin.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/39174306717.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/75823290584.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8846c3cb---79260641510.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/uqai2i2ov4aaqg56cms7d0c7at/lavuju.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cu2mfj6v5h258mo82flj86qj89/kuvosojaluluwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=raja+shivchatrapati+book+by+babasaheb+purandare+free+pdf+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11492 bytes
SHA-256: a74fe6064b72b5e48c47fdd1186a257613f9be8019490458c3b8578b3bcc82db
font_01_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 18888 bytes
SHA-256: 6426b0851818d3779dfa5170f947ed7c618bb65dcbd592d2495bb2be03d5e7c4
font_04_sfnt_off00016948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16948 1968 bytes
SHA-256: c7e7d125e82ceae927dd20a3878939955b4934ad90e0cfe7997f0c24e50dabaa