Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0276a2c6871232…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 13:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a81b7d60727cecf8dc87e5e78268e049 SHA-1: 3b4a7e59cdbf6336e647f312a9a8daedfcb3108f SHA-256: 4d0276a2c687123229dd4bfb1f9de5ce5cad8a6c38bcd0a34e95d8b378e93d39
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://heldermusic.nl/ckfinder/userfiles/files/tegedokir.pdf In PDF document text
    • https://baobihungphu.com/media/ftp/file/nefatapofurali.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/83898167026.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nukeginunifirux.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/92706359640.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/15546858898.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106132031.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/rotesatomonujupedemifu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27b1e7e48---61439015636.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095d6ee3e444---doripezizakam.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607027940114f---powepozomuvisaxovi.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/91904391690.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/pibezugoxodulokitape.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2ea9d9adc2fbb2052d1802a0142ddd8e/pinuwazoxidodugagerufa.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/welivejurilurulosijemole.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/92581201883.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/85737229678.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/84167535457.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/342ddec2f021fb16f575c044fb1d390c/fonifawononosewoni.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/gejusidedowonetatu.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21845370356.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b2719074b---ziwepekujipudug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pr%C3%A9sent%C3%A9isme+au+travail+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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 10860 bytes
SHA-256: a0f903e70228d91a905b9b93a54dcf7f0b603ca4c469ba57567226adbd0483a0
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 19232 bytes
SHA-256: 3452c53b60e1c5100633724c1472092d5cbaa929a296c5ebaa75f65f148e9acd
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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