Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0043577a297a45…

MALICIOUS

PDF

85.0 KB Created: 2021-09-25 19:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e82e2e42787ab0ff53f25c0f8f9ae947 SHA-1: 3a9fb731e70360bc13b4601278e97a9c78c98ea7 SHA-256: cd0043577a297a451b94ba1317efc8b259d48f6a3c55d6415f683413c85b4e8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8866

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://lejuriste.ru/files/file/69338618518.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614db0bd5d922---wufefisawarut.pdf
    • http://abbeytraining.net/userfiles/file/rizor.pdf
    • https://bevillelecomte.com/ckfinder/userfiles/files/41215441679.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161410e1d6898b---63043489731.pdf
    • https://geya99.com/ckfinder/userfiles/files/10382469180.pdf
    • http://jmyhship.com/uploadfile/files/gikefuwiwonezopifi.pdf
    • https://www.campacinter.com/image/upload/File/89214452071.pdf
    • http://ros.by/ckfinder/userfiles/files/zujife.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/67770730884.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/56843708929.pdf
    • http://teamtrinity.net/trinitya/file/25253261966.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sefepevutoreramuf.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ec413954083227735477455cfd07d579/jivupukewimeninu.pdf
    • http://anpharma.net/upload/files/gijobesomive.pdf
    • http://maszyny.pl/userfiles/file/69243589709.pdf
    • http://racecross.com/upload/edito_fckeditor/file/61423296343.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/p9is0uoo45uqj8d2iseoupsipi/jitored.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/2630363241.pdf
    • http://stroyvodservice.ru/upload/File/kujifijixiwabexuviz.pdf
    • http://studiopiergentili.it/userfiles/files/67587317956.pdf
    • https://gyn-koe70.de/obrazky/file/36642348628.pdf
    • http://terralis.eu/catalogue_dynamique/file/41094648045.pdf
    • https://siemreaptraveltours.com/userfiles/file/werajir.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614896ea4e864---vetap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lo%E1%BA%A1i+b%E1%BB%8F+qu%E1%BA%A3ng+c%C3%A1o+android
    • 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_off0000e33b.bin
945bad088cc2fd9f5cbb548e44bdedc8004b608ab1f33b2a0ba9d9736e0a93f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 29436 bytes
font_01_sfnt_off00011c0c.bin
3919d156efa3d7080f9a13cd114526dca52ef4db809d8707f468339b02db3a94
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 11260 bytes
font_02_sfnt_off00013445.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 16792 bytes