Malicious PDF — malware analysis report

Static analysis result for SHA-256 d686d1e24350487e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 02:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1545f646618185e67da0335dacf5af94 SHA-1: fe3ffe39053825edcf8b65cc54d4653754e2d19b SHA-256: d686d1e24350487efef3137dbd1e9cdb25b4b0a64fc6756642acbdae3187a7d6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The primary goal appears to be directing users to potentially malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seedomoretravel.com/files/files/javetatonujujoze.pdf In PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/vabirabewesokinabofuxex.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/pubebasazetidepoluv.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba09d7385---83034402324.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be45742903c---93479241539.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb885ea98ef---18822487819.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/72781803576.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/jisibutajekawab.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fiponamipakolo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rq3u4rhj1c3p7oa9hjtllb7f11/62708264290.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3671741222bbd64fd5f2e6570edf0cd4/bavukotodulupeje.pdfIn PDF document text
    • https://atiksigorta.com/files/11413426362.pdfIn PDF document text
    • http://schokozentrale.de/idata/siwikudimikaruz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/96a70b9e2c76cb4e6fd28275bea6aee8/jegax.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/15977039278.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4a6cf117---genunozurow.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ec9d938f7781188e57f3237fa2d3ee11/ruzofuwopewaxevosufofow.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/rixapoj.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/popelutazogegalinazovok.pdfIn PDF document text
    • https://pellevah.com/upload/files/63674808755.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9ff8babfb29cd9974f583f1ba6170202/40760577717.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/92816347047.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41238726258.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fae46e42dd---vuroguwalakapokutifupasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=label+eukaryotic+cell+worksheetPDF 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_off0000b8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C5 10712 bytes
SHA-256: 7a92088df7e625853385209294d1dc8277a3b8198576c925e3453df647e3a200
font_01_sfnt_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 14664 bytes
SHA-256: 4e92627326199e936fa0e4385e117eef1c52aa552285975e916be29c465c9b36
font_02_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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