Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff9520bd8c9b532…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 02:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30ea9c38880a91669362694e0e80c64 SHA-1: c05a6b7dd88fa909f7bd9c971e2b35e8c4a5592b SHA-256: cff9520bd8c9b53204968801eb2461fe5b9e907987fc8989039f8577bdeeeba1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=fight+ghost+kdrama
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b133c4803c8---nonavabapuzuroxov.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4628a1f6c4---furifexaboxazizutop.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aece72caa9---zivulopizifelagotanex.pdf
    • http://hyundaiokla.com/uploads/files/fuvumorupufewiwelozeg.pdf
    • http://dermaktif.com/imgup/file/vikegulo.pdf
    • http://e-sportis.com/images/upload/zebasiwopu.pdf
    • http://skupka54.ru/upload/m/6186498463.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098152911e68---41791313039.pdf
    • http://reicar.dk/userfiles/file/gumatamemilipibewixemu.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a6351ede848013a1fe5af75118e3c73b/duzenidizesilojixelemez.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n10olq537fb9u4jh0uuki1dji0/gizonibexabakefuxitujumo.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/75be834b58290e3d41488228d324c24e/26933481079.pdf
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k08icva4f6s2n2cn6f97bc9hj2/52743926479.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c73b0e190---75484032857.pdf
    • http://www.serenissimaservizi.com//files/pozomafasar.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b6020bdb---15956349187.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/mebepajuzevaferetawopu.pdf
    • http://studiodabo.eu/userfiles/files/86009937868.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088733bc351f---salizakuvoz.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/bupodororefepalixuvorezu.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/68226573049.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ada7d9e9---66594682328.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s168082b6vcnlmbiiqtgv3ka02/67945595686.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/f6cq0vmaie4hmagbrjqhjt9kkp/wawojerelimusox.pdf
    • 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_off0000f3a1.bin
97fea5f571a7b37ad4e4604c1d4dbefcaf4fc84ea6c24bcb873f93c135497352
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10484 bytes
font_01_sfnt_off00010b35.bin
d86e4e38659b0f7306f7e15c968e3edaac94a3f300ca50e131948e156a222046
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 17412 bytes
font_02_sfnt_off0001380b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 16792 bytes