Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eff3ab6b456e21…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 23:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 324a0b8d440ad169684a2e7cb24f5156 SHA-1: 38b12ac450b74010605bb5386fa5d2537b4f3b7a SHA-256: 19eff3ab6b456e21e578be0456586382b1a08ce93d24bc9d5f4de53c0e1f5f71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites, suggesting an attempt to host malicious files or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c204046e810---lovubafa.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16091f66dc3dd2---11223913236.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160991d1d9633b---zogimisuroselizeked.pdf
    • https://dbjadow.pl/attachments/file/85360642276.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160927ab722afe---1385292555.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160964146a4caf---zukikaridajizetomugukigo.pdf
    • http://dawahcity.com/userfiles/file/86389889476.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5953914---xexepigoxafiraduted.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/18504ef39a9c09d904c56e994a836a38/dewimu.pdf
    • http://micronforgacsolo.hu/UserFiles/file/wovivagenijedilinokilas.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c9b0987554068e3a52afbdbc3c05aada/8141145779.pdf
    • http://myucmas.com/userfiles/file/36567132100.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/58701ce5b24441a03b7dce07620a8258/ponejasomukokerorerakula.pdf
    • http://rentaruedas.com/files/others/muwiwekifa.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0564351e39dd388b8d67d68317b8f1e7/54412820384.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799625d64a6---56375286290.pdf
    • http://vtvxm.vn/userfiles/file/zomozisajevapubudis.pdf
    • http://cga82.com/admin/File/11019534463.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c85698a9---29756427930.pdf
    • http://adamlegal.com/userfiles/file/dujigavigiranezegugijikaf.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29b59f976---vawidakagadurapividosax.pdf
    • https://daaeportrett.no/upload/file/godagamamenobotasizeta.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/jemirunisuk.pdf
    • https://cooperspick.com/files/87427805411.pdf
    • http://chinalanpa.com/images/upload/File/pipetenizimumesafejujaw.pdf
    • https://nestsearch.in/admin/uploads/file/xuliwaligewixatexoxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=1.25+cups+to+oz
    • 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_off0000ea23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 16792 bytes
font_01_sfnt_off0001023a.bin
f0e84581d6d7d408590e23e0566d5362e93272e82b443caab4b65b883477fb28
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10164 bytes
font_02_sfnt_off00011942.bin
5ba52e7b809ef026a5c33a875c808b98af2dadae9bfca0ca6fd2b92b2da5cbbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16976 bytes