Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dca073a79eeb09…

MALICIOUS

PDF

86.3 KB Created: 2021-08-16 21:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 081b83e2691408fe09236b0ef74a1957 SHA-1: 3b8f815752fb290dd5eff774a389f2e87e01e9ea SHA-256: 78dca073a79eeb093ac08739d024733170f747aed1ec8f80a590d6f46870c31a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nbkhjc.com/uploads/202107/file/210725080548160908fueux4pcfgjg.pdf In PDF document text
    • http://thanhtindesign.vn/uploads/image/files/lutesexojotinexevap.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610011da9a87f---bilawokikuvisinovaluzoxa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/832eab9bab6729e59f419bd326ebd772/67637791836.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c9b81169b86911cdf55a9bc33e8f024/28775317273.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a3ecde4---35673411891.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/fupalavadinubeloxixipiro.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8ee82356---womiwaxudadizagexaj.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd591f4fc---51567334246.pdfIn PDF document text
    • https://lemanssrl.it/file/lidafatunimixorababorin.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/87442198292.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/xomol.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zekesowobuwosuxijorarofe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc622013e0---povapovi.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/11821817366.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/6493174466.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d0e36d833---musazuguxe.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jokovawe.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2487b5b8961e092f68c278a53fc0d6a5/43484262983.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600017c4bf---39683782720.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/99232781417.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/45942859229.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/lazogaxazepobaku.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b436ef447---lefomesexebejuv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7aba7285---39777788625.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf18e9b25---64403829063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+deviation+of+beer+lambert+lawPDF 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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17280 bytes
SHA-256: 9dbe87e95c33b207edb26643d2347b7398a0092b9bae0964f9ae5e3f15fa3e55
font_01_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 10736 bytes
SHA-256: a2df2657e347e7cad7481b059d00ba59b8d1097a049068844731ca147e1c9c24
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.