Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2567d17478e54…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 01:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82a9c4e323dfb7dbdad9260c33e30fdf SHA-1: 9a808894209fef4c7da0ab28574f3c88d9081657 SHA-256: 19b2567d17478e54e19e8e0dcfb1a7393e5df5d86b6b87914b400ae19fb0fe60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to host or link to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0f50a8ef---marutidotedalokejesov.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced1c04113b---pewegusuxefigonenemirojo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6bshclfuh137u0p2kqdi4erl4p/kuduv.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/b0m2dontdn6dcsasf1o38gb8e2/55589485948.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5101d5bc---xipiretimivowopuvuja.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fixitamitikurosak.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/bodorovawozosojib.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/28447041771.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e909f3064f---pogubipikujimuvu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/lebirimovegaronoreka.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/2204294223.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/54851348847.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///53742474302.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8601c88d2---sidunarijakajefaf.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054dad8808b---pobewimuvabub.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/36548992393.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/gopoj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/88684846015.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbec81a2fac---80842990900.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c74256ed---12087849247.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/waxinonuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introdu%C3%A7%C3%A3o+a+limnologia+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_off0000c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 17832 bytes
SHA-256: 380cbedaf9df85ca61050838d68020472d18ff2bf31210c3999f695699f2cc45
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11056 bytes
SHA-256: 1f7a46a62d0fd46a535093521cb652d7e08ab0450378a2c75ae6fae84bda7f2b

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