Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec6dda14d597ea3…

MALICIOUS

PDF

105.1 KB Created: 2021-07-02 07:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38d8e4d147284a98a19602f155889e6d SHA-1: 8c788600db699050d5bd568244492b6a21d54500 SHA-256: 4ec6dda14d597ea382fe7df628596dcf3c8641729297b0730dde883bdc289f90
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kantoromega.pl/userfiles/file/taxis.pdf
    • http://bundoreh.com/fckeditor/files/file/buridejerawilexamivivepeg.pdf
    • http://www.lugashotel.com/data/editorfile/pefid.pdf
    • http://amandamaitland.com/images/file/surasubejosixatex.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/55282140393.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c467d8008---tafonalezibabifevizor.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd224e6ad---gixube.pdf
    • https://muratay.nl/userfiles/file/basosozizedag.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/rutusajadikasukomevolazug.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lafonetupobuparaxixubeti.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b256fa02f21---58515862617.pdf
    • http://nessium.fr/userfiles/file/xivomefuxafowadafaxosura.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f548498139ca5191f075412a9176f2f3/2870333609.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9100bed886589d2b6cda42a56efe3ad4/66886988947.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/40lnfike15mrsv9nspivmdj7v6/90542897289.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30db3a372b---badalufixemoxen.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2ccdc76---jabasutesitet.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1363b283d---jedekufekavozedabe.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/74975906944.pdf
    • http://shinies.ru/img/lib/file/40582226568.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f1694dec---44290822176.pdf
    • http://hoangle.vn/uploads/userfiles/file/rinaxelijufage.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=most+famous+debussy+pieces
    • 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_off0001354c.bin
2934a77e974513f816fb8465e91dd46e7a09726753386656baa01a424b911b01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 19012 bytes
font_01_sfnt_off000164c5.bin
c9be0ecfbbc4f7e19d6cf308957b931f74665a3ddddf269bd6232606f65171cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x164C5 10876 bytes
font_02_sfnt_off00017dd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD5 16792 bytes