Malicious PDF — malware analysis report

Static analysis result for SHA-256 413c737aa837398f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 05:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3739a640d8535147e2fcd51ec2400486 SHA-1: ce00246daefe4077980ed8c370bbeeabab2ee4d9 SHA-256: 413c737aa837398f264c467e18d517f33ad6e04f8bad11fb6587e4b57d851bb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing or malware content. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o4t2r904en927l8nnbre6dafm0/xamotewelovameseniwodu.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6eace3dcddb2e9cf659d2fd7e777df27/kunotuvubini.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tafogefigogigakuranez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/kesapamujabofi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ed4e5dcc09674c3f2013009c012b2232/badipavojopobegivusax.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/rixepujiz.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/80818485077.pdfIn PDF document text
    • https://beliangka.com/contents//files/52461084241.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/31005788681.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/13987045268.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab55de6cd3---19817032901.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/93635162453.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160762e7ebaf83---64958616451.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/bijiwamuvale.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/84081522343.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ec661be9b5902c883e2a8acb7d7bfa1/jurerapobazerep.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4rb6c6lr3ukurl5sej5gvrgj1p/35400665813.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f7278a6173529eb34a590e0b53b85aa4/jumaruwojitutebexufeg.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/7564087249.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7a832d21---mudosol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=urdu+historical+books+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 11140 bytes
SHA-256: e087a0f53be0d1b12a293565bb1b2ab59797c95f6c154a3dd14b804d14ab22f8
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 23040 bytes
SHA-256: b7e8cd01a00f08aed56fa81ce6a7f5d6ab773120772b5d6672cb96ca2ce892b2

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