Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea233e657e037685…

MALICIOUS

PDF

92.5 KB Created: 2021-09-07 17:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae5c3c7159e14daabeffb73bf6f051bd SHA-1: e577d046bc72879011246e7ed39a593013aa4ef4 SHA-256: ea233e657e037685054b47e2d28edffd7df032588c55cb8b9ba71f8c3554cec7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fejesavel.pdf
    • https://tonwen.org/userfiles/file/39211604398.pdf
    • https://avigailpekelman.com/sites/default/files/file/tibeke.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/88260f2f87b9ee986e1c8ba6fede6d13/kaluzolevopikubewokekiv.pdf
    • http://gardatrans.com/content/Files/kemexapitepaneminosuxufo.pdf
    • http://unsersohn.ch/images/file/wurase.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3553a913---leposanilopaxaru.pdf
    • http://anandtouristcorporation.com/uploads/nepivikis.pdf
    • http://robalton.es/Albums/images/file///xivebaruworibuj.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd91ec969---wupodajojizezarufasez.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612629be66628---4922996477.pdf
    • http://newkontakt.ru/userfiles/images/file/60940405580.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mq5s5unc737lradtgquiarf94i/dudezezi.pdf
    • http://mextro.de/upload/files/furemakipogosanedotu.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/304165298.pdf
    • http://cnzgks.com/userfiles/file///6937178795.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/rutowati.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16083201bc0acc---xumemovipeguwowokefipar.pdf
    • http://pronobile.de/catalog/file/8488006138.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/20074316a72391f4fa336bccac3ed06c/puxomoposewotozuge.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/20267063604.pdf
    • http://matkinhantai.com/luutru/files/92703024610.pdf
    • https://ukmalayalamnews.com/userfiles/file/19760960505.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116795ba911a---40076793074.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f1abc965f57---3402567157.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=control+systems+engineering+by+nagoor+kani+pdf+free+download
    • 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_off0001005e.bin
4bcae82e68ad6c20d11c4b59b1732dc52f497a98da4bb827980d9d8a1104b667
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 18676 bytes
font_01_sfnt_off0001314e.bin
34236372eda291dcd48d4b6eced2dbd988d350d05a39e8f33b943b3139aaeca2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 11304 bytes
font_02_sfnt_off00014b92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B92 16792 bytes