Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bbe153ea4eeeef…

MALICIOUS

PDF

69.4 KB Created: 2021-09-03 07:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 430399358ace2d8a8eef89647de9a510 SHA-1: d3101878f480bb8060e3af9eb5c41be91f519311 SHA-256: 61bbe153ea4eeeef5ae30434c474522dcd54a40ff6310fc508ee628b2b5b4e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'tax return form' in a URL parameter further indicates a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://stigstudiotecnico.it/userfiles/files/60140847786.pdf In PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/wuboxomu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pgqvpeiulrd0orbj171b2t45h0/80274736812.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/11885763549.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608553e3cf2a4---10462649544.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/desifin.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d305f1997b8341756a38d12e8d27743/8117826366.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c6b963d6c9f0f1f16ca2506f97e7588b/wugupaxazibuwixorugewumal.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3ed341c68d8f73dd35bd2fb97fd68760/vogugotilavawitez.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9340ca5d7d---67099623046.pdfIn PDF document text
    • http://artediapharma.com/upload/files/7535452615.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnfe8e562hbsrscg265sjpdalv/82588744888.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/89120594063.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be03d41bb55---154013054.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210607_BE81AC67D8EF5DE0.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/87199561357.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/voperejojuxukoj.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73b77bc01---gozifawikijofitefi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u096be8om54qnafgbvlr41uh9o/rijanovi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/001449f4d630b400bb2f581cdec1b5a2/44021783334.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947202a433f---39430814634.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f4ddec8bbfe45d0db4206391ca0ba918/79965770905.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/13988960770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tax+return+form+bangla+pdfPDF 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_off0000b04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 15528 bytes
SHA-256: edce237ea6b3b9f17cc21d1b9982c7ef4617c1510e92bec711e8e90178073c2a
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 10888 bytes
SHA-256: bc7ed94fe313585a10db468494177cb6d16bf2576bfafd939b6aee2267ce2503
font_02_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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