Malicious PDF — malware analysis report

Static analysis result for SHA-256 587896b15d1a2138…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 13:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6584501b2bf96db2f638143c2a0a1fc0 SHA-1: 7a4e9a3fccec0229a6c5fe49bd23aac9d421f396 SHA-256: 587896b15d1a21387de52535a1b6b67f0f3471567c9919368b8d79bc72bb8809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=gta+v+engine PDF link annotation
    • https://spa-salon.ru/ckfinder/userfiles/files/jelamowagoditezemewozu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/liduguguwav.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b24603b56---sitawoguwavuzimixu.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/ritekobofeduxoniravugap.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e654dba850b4e779a62905ec36722b9b/fesapaxibelijezazizo.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/mixatuludutesixida.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vimukomumatizow.pdfIn PDF document text
    • http://intersonik.eu/upload/files/jugokutejodivag.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rozasaf.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/8669800160.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161430d5555e19---92334496119.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rujajapelezewisak.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rudireralarosajekotisi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cfe8f5f0f940888ad5cd9ad215f77063/vazumetokufunotejizele.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3rier76mdi9lchhki80tuijgek/tobidezidav.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/kuwukapomagaximufufibi.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lasevusikulir.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/jarulujupisifadub.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c323ebba5---fatekoluson.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/19125811295.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/5581831755.pdfIn PDF document text
    • http://superazs.ru/images/news/file/40464764721.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631964707.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/51523807766.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/12704641429.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/peximurabilifikamazakeriw.pdfIn PDF document text
    • 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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 9956 bytes
SHA-256: ba28d20ae2d495db57fd91ee519cea442f1a4cd7944b2f2310a59d9ee9c5fb7d
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 17600 bytes
SHA-256: 708620f8b56f6735fed053aa8710973bfe6dae2b2431de9881810e847b4746aa
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1