Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b8da0b7bcdcc62…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 21:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da75f649d03b1d907113ea9dc3d74cb SHA-1: 2deffbdc0900c9985d0bb988905696c9aad9d8d2 SHA-256: 26b8da0b7bcdcc62da0ec958563a34806580d8f769952dec4470f9b00391ef8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised CMS upload storage for hosting malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=ben+10+ultimate+alien+mod+apk+download
    • http://coumert.com/images/file/popavotasususo.pdf
    • http://unsersohn.com/images/file/2781397184.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/74404615918.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/93336840507.pdf
    • http://grafiport.com/userfiles/file/nozuvenidede.pdf
    • https://beautydent.hu/editor_up/45650566584.pdf
    • http://ccsilver.kr/files/fckeditor/file/411236807614251bab9750.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pelexajazuwakuririvef.pdf
    • http://jurabos.nl/include/editor/file/84935012932.pdf
    • http://el-master.ru/userfiles/file/62976252743.pdf
    • http://streathamtaxi.com/survey/userfiles/files/nowenarumamidejepefe.pdf
    • https://magnanerie-cazilhac.com/userfiles/file/68327249126.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa9925904---mejusajovanefikelu.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/83015600477.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/78264412209.pdf
    • http://spbi.cz/res/file/86979969371.pdf
    • https://palet-school.com/files/files/74122533077.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/26345071979.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/bowogadameke.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/wedulojaseg.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a66a4c6c---todejubonezenare.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433a64ed261---27823377594.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/2709751877.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_off0000b540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB540 16792 bytes
font_01_sfnt_off0000cd57.bin
6c6c1002fed45569b4b00924e72abc7cd77adf4d17d69cfa1d6d1a9a3892d32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 10792 bytes
font_02_sfnt_off0000e63a.bin
2c3c27ba72fd02696f7de33c42415bd202db807e6868a0235afffe1ef838f76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16504 bytes

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