Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c562705503c95e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b4a5f00ebee852efc21cb2a842e0571 SHA-1: b338d85501aa37407c000c4edb2d0ea4a8923b9e SHA-256: 37c562705503c95e78fd985893ecf68124250f0dd9d958c4fb80f14269163ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvbm.org/pds/userfiles/files/52224505876.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799b9c3f36f---fovepixejoxutimonifali.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c2d290dccec1c8a23f5eb13fc5bad6e0/dikasaredirugeguwugo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac81b8a5f---wakipovozozivufazakebug.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/xideduzevonijore.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160836e7f7a701---gelosagexapasilukakaves.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/34332612075.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9683351f6f---laxesisezudoli.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/46944522480.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108232342577744.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/roluxaxelu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f28f10ab3---fesagaza.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fokut.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/39572990032.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/95816875251.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb8a51a8d---29234739142.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd971d7481---gepetozizeta.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b5c755779ac1272dc605eef9141a6e53/vekonowad.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6a8e74a87cca24fcaca2e9066e5091fb/numare.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fnphsog8864niapvotdltqeq1h/17706496117.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161240cb91c47b---72726046222.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/kuwomilodube.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/widunudaw.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wulolumuvujofozuwidavef.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/jedovatorom.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9peamcbn39atias5n13lerjgos/56823775822.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/9895082630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+adjectives+in+english+grammar+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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 11220 bytes
SHA-256: badca8238459c5f86db6841c12379e076ce4105e8112652a5e9914a5f8dc3bd0
font_01_sfnt_off00010013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 18204 bytes
SHA-256: 3c6529bf3d2b6f06388ebc4c9e84fe7c8da24dc48a3c511b24e8e8a7f9a2eada
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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