Malicious PDF — malware analysis report

Static analysis result for SHA-256 e770f98641c206b3…

MALICIOUS

PDF

86.5 KB Created: 2021-08-04 23:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 646324edc8caacb9183f552f049bca29 SHA-1: 38227d27182c3aca8694b5f768ef617e4e629722 SHA-256: e770f98641c206b3e5dbbfc2492f3b0623fe2fd48756ddcc4416fcdb3d224abf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for 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 0.9974

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://synerhu.ru/uplcv?utm_term=como+calcular+el+area+y+perimetro+de+poligonos PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d8f7f3024---natujo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f6e6e2733---99217197092.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ki8t1ldhj48tv9khk9uinro0k/21077269349.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b371531---gukaru.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/83757698432.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-29/20210729215533435320.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9aae2005ae38ed32144bb6074f723537/42328824936.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/ligogezigawofasafixasu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4f706720---mozum.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/winirabevisane.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4a29724138d338d73a0246a8a64d0532/3110001903.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7e1ed6b23b9e58c32d2db460819a8783/13318209246.pdfIn PDF document text
    • http://sbcnepal.com/images/file/folanojafa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jijizip.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/milire.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/posebuvoti.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/65907042382.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1dohkqv9395ah177e5npggckm3/sosipuwikuvesev.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/12995020757.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92964269803.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/57511980264.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f25cfebdba34976d22320f75d2cd82a7/wixidojotebotimutakuzew.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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 19704 bytes
SHA-256: cb31f7ae6d625cf2a569d0215012d81c8ffe7aa11e5a985e5e65eeef63bc59c7
font_01_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 11100 bytes
SHA-256: b89531419b8743ac6efc77675970753a80ad9d666ac95f1fcaede60a1c4225b6
font_02_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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