Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bb9bcc46bc1288…

MALICIOUS

PDF

85.9 KB Created: 2021-07-30 14:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7b3bd13aaa37946206c4d1f797ec6a63 SHA-1: 2ebe4513dc4386575a23f9d97f69edae5a4a334b SHA-256: c8bb9bcc46bc1288bdb05394ccc1af75c87cd90247e5d340dca4d8bc226e2e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, characteristic of a link farm or phishing campaign. The primary purpose appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=moldes+de+letras+cursivas+para+imprimir+y+recortar+individuales+pdf PDF link annotation
    • http://ck-tct.ru/userfiles/file/tofomeliwugizuvizodit.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b6675196---kitivax.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/51a8b028c1de6c23a5f53c34d75e8beb/roledebofaxerexu.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/80807057319.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/22605922865.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4866b3df93---66384252264.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da69064f46---fesajewenewapiw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/fuwokijetoxi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/legofimoxojafokizas.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/2392596075.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/93656005429.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021071923453673499.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bokiguzawoz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5552ea72c9---jikasit.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff95ab854a---13161674460.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe683a8fc---majemoluzisi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hm0fr9a3fkqpuerh1qjq394t00/91987809487.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/xodabu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xozenebigin.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5632788aa4eddb1b3891af2177eb7d18/vefuzomorugudizawu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/jeberarijexakim.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703992b47b1---83555149521.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/16226053798.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_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17784 bytes
SHA-256: 476148d5a4e776ffe18e9af634907694e7811bb43c1c0d25d30ff33568ba75d4
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 11056 bytes
SHA-256: 4db56c78e02acc17b933791c3ae3229ffa4c1b14876deba530952a47e07b0ad6
font_02_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1