Malicious PDF — malware analysis report

Static analysis result for SHA-256 77147aecfac2b31f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-08 15:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e688fee6a4b19ca90abac6d8cad23d12 SHA-1: a5b317c3c7f370967ddaf76ae84ce41e87cee819 SHA-256: 77147aecfac2b31f44ea9fd865a444e67972040b92f76d783e297c59b8debaff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e2fa9c1f8092a34871122772a1e96421/zolegonazupi.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7a84f1fe---dalutenizixekiwo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5b982d5d---37434154088.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06707f2aaf---48348195004.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad814bc7611---35995277009.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609858662407c---10086274659.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/0ff9c2f85a37ad9f3a7b0920450ed6c4/lotonenelow.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kisinajavoxesidu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/826917999cab15aca0f11266d90180ac/laridabupaxixalumevunilaf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160827fe70eea8---86858136501.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073641f7cafe---metoxufapiwopuwivebiza.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b776b961f1f---17314183062.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a1ecd617e6e83a050fe76f9c754c8f81/koporasuxo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b754da07---20045793810.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25e362a7b---70564815472.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5c253ba7985516ec9987f62aa76ce2d1/joraxagesobelebe.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/67101401879.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d2ef69dbb---vakasujejobutirigiz.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/19270299540.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080756e47a4a---kerevilat.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/15626013625.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb4102e10---vosoxufekemigowitone.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/911384941.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f8aab96a---96189932167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=second+degree+scald+burnPDF link annotation
    • 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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 10668 bytes
SHA-256: 32e5789d8422e312181e5a8ae5c81dd04b714e29f87b71c26bd7a2d611d485d4
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 17664 bytes
SHA-256: 5e8780bc1619684e6dea9730e25c7b73c3d2fcebcb72cb052143650e245171a5
font_02_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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