Malicious PDF — malware analysis report

Static analysis result for SHA-256 626751ed5a62f040…

MALICIOUS

PDF

96.9 KB Created: 2021-07-30 13:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dde2f005f923067cc5729c92894016f SHA-1: 21fd702797984522337ade7724a7e7f4de036946 SHA-256: 626751ed5a62f040487d89ded7f67cd364572d081a96b687c3365b4024484a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to WordPress sites with formcraft or super-forms plugins, suggesting a link farm designed to host or redirect to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=bo%C5%9Falt%C4%B1m+sistemini+olu%C5%9Fturan+yap%C4%B1+ve+organlar+6.+s%C4%B1n%C4%B1f PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d26b91386---15047614781.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/xogegiwulub.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/7381420111.pdfIn PDF document text
    • http://acril.ru/ufiles/files/50611766005.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/589830621e2c65d5fac89af80a60995f/renomarovowudubizujewine.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098924934f03---96244904648.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/nk96uubkimpd3rgbuok6l9mg25/27177645269.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d9319a5a9e380a120519f37b47985c09/12655130036.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8ebf70477aac93cdbc1194c09fbc4df/15613221955.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/73522962428.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/vufanupad.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/78181521434.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae8464cb5f---sivom.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443bf28299---vetujoforuzebazon.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/82954104267.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a87d8119dad---jagox.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d07627768---83755235325.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/8268235293.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wusazadiregiboligozefibe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0103316001619919959.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/68800842345.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95e91cabe---4102962597.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/98572727932.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b673606f68300ab9df3399c62faecb81/kojoxigabekedovetox.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_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 11556 bytes
SHA-256: 38c989ab0709fb74d2c6aae6e3efe3e32edf020e6ef330d9472e0c7a84dd55b7
font_02_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 18896 bytes
SHA-256: a98ac8144448bbd46e2181432f4d2ee8176835b998152ca9db84a473485d259d